Merge pull request 'v0.22.0 — ISS-022/025/027 hover route trace (job list, on-board rows, relocation panel)' (#34 ) from feat/hover-trace into master

fix(e2e): renderedFeatures — evaluate maplibre geometry getter in-page before Playwright serialization drops it
fix(e2e): expectHoverRoute — ignore queryRenderedFeatures artifacts without LineString geometry (CI run #70 )
2026-09-20 03:58:03 +02:00 · 2026-09-20 01:50:23 +00:00 · 2026-09-20 01:22:23 +00:00 · 2026-09-19 22:52:12 +00:00 · 2026-09-19 22:01:02 +00:00 · 2026-09-19 21:47:00 +00:00
17 changed files with 703 additions and 234 deletions
@@ -1,18 +1,16 @@
 # Flight Simulator — Workflow Rules

 ## Change process (mandatory)
-1. **Small, incremental changes** — work is done one change at a time, in smaller parts; each part must be tested thoroughly with unit and e2e tests covering it before moving on.
+1. **Small, incremental changes** — work is done one change at a time, in smaller parts; each part must be tested thoroughly with unit and e2e tests covering it before moving on. Connected issues/tasks that reference the same part of code MAY be done together on one branch/PR with a single version bump (e.g. two UI tweaks to the same panel).
 2. **Feature branch + PR** — every change lands on a feature branch off `master` (no direct pushes to master). The branch carries the commits below; open a pull request to `master`.
 3. **Changelog entry** — every such change is listed in `CHANGELOG.md` with date, time and version (format: `## v<version> — YYYY-MM-DD HH:MM`, then bullet points of what changed).
 4. **Version bump** — the version is updated in `package.json`.
-5. **CI must pass** — the PR's pipeline (build → unit tests → e2e, `.gitea/workflows/ci.yml`) must be green before merging. CI never deploys to production; its e2e runs against an isolated stack inside dind.
+5. **CI must pass** — enforced by branch protection on `master` (required status check `CI / build + unit + e2e (pull request)`): the PR cannot be merged until CI is green. Merge via auto-merge (`POST /repos/{owner}/{repo}/pulls/{n}/merge` with body `{"do":"merge","merge_style":"merge","merge_when_checks_succeed":true}`) so it merges automatically once CI passes. CI never deploys to production; its e2e runs against an isolated stack inside dind.
 6. **Tag + manual deploy after merge** — once merged, tag the version on `master` (e.g. `v0.13.0`). Production (`https://flight.dev.kkhost.pl`) is updated manually afterwards: `docker compose up -d --build` on the host.

 ## E2E tests (mandatory)
-1. **Docker compose instance is the app under test** — e2e always runs against a docker-compose build, never a local `next dev` on :3000 (dev builds don't render for non-loopback clients, and a second instance splits state). Locally that means the Traefik-routed instance at `https://flight.dev.kkhost.pl`; in CI it is an isolated stack inside dind (`docker-compose.ci.yml`) — **CI never deploys to or modifies production**.
-2. **Update before testing (local)** — deploy current code first: `docker compose up -d --build`, then run the suite with plain `npx playwright test`. The config's webServer block is off by default; set `E2E_DEPLOY_CMD` to have Playwright itself run a deploy command and wait for readiness.
-3. **Remote browsers** — local runs drive browsers through the shared Playwright server at `192.168.1.4:3000` (Docker image tag must match this repo's @playwright/test version, pinned in devDependencies). Set `PW_REMOTE_BROWSER=0` to run local chromium instead — CI does, because the remote server cannot reach a stack inside dind.
-4. **CI env vars** (`playwright.config.ts`, all optional; defaults preserve the local flow) — `E2E_BASE_URL` (app under test), `E2E_DEPLOY_CMD` (webServer deploy command), `PW_REMOTE_BROWSER=0` (local browsers); `e2e/state.spec.ts` reads `E2E_COMPOSE_ARGS` for its mid-run container restart.
+1. **CI-only** — e2e runs ONLY in CI, against an isolated docker stack inside dind built from `docker-compose.ci.yml` (project name `flight-ci`, app container on a static IP; see `.gitea/workflows/ci.yml`). There are NO local e2e runs at all: locally you verify with `tsc --noEmit` + `npx vitest run` + `npx playwright test --list` (typecheck, unit suite, specs compile and list), and the full e2e suite is verified by CI on every PR. **CI never deploys to or modifies production.**
+2. **CI env vars** (`playwright.config.ts`, all optional) — `E2E_BASE_URL` (app under test; CI sets it to the in-network app host, so the config's default of the live Traefik instance at `https://flight.dev.kkhost.pl` is never used), `E2E_DEPLOY_CMD` (runs as Playwright webServer: deploys the stack and waits for readiness before tests start; CI uses build + `up -d` + `logs -f`), `PW_REMOTE_BROWSER=0` (CI runs local chromium because the shared remote browser server at 192.168.1.4 cannot reach a stack inside dind — when unset, the config defaults to that remote server and to the live instance as baseURL), and `E2E_COMPOSE_ARGS`, read by `e2e/state.spec.ts` for its mid-run `docker compose restart flight` (CI points it at `-f docker-compose.ci.yml -p flight-ci`).

 ## API
 1. **Live base URL** — `https://flight.dev.kkhost.pl` (the docker-compose build behind Traefik).
@@ -1,5 +1,35 @@
 # Changelog

+## v0.22.0 — 2026-09-19 21:42
+- **Hover route trace on job-list rows (ISS-022).** Hovering an open package in the right pane now draws the ENTIRE great-circle trace between origin and destination, not just the two endpoint rings. Zero pane edits — the rows already sent `{kind:'package', originIcao, destIcao}`; `components/Map.tsx` now derives from/to for any hover target carrying two ICAOs and pushes a new pure builder's output (`hoverRouteGeoJson(fromIcao, toIcao, airportsByIcao)` in `lib/mapData.ts`: one LineString via the existing `greatCircleArc` slerp, empty FeatureCollection when either endpoint is missing from the airport index or the `''` no-hover sentinel) into a NEW dedicated `hover-routes` GeoJSON source + top-most dashed `hover-route` LineLayer (paint: `#facc15` matching the airports-highlight ring, width 4, `line-dasharray [2,2]`). The shared `routes` source can't carry this — it only holds FLYING legs, so an open package's or a grounded relocation's planned route was never in it. The layer is added in `ensureLayers` after the highlight layers so style switches keep it; `applyHoverRef` re-pushes data on every hover
+- **Same trace on On-board cargo rows (ISS-025).** Each `onboard-package-{id}` row in the left pane's On board section now reports `{kind:'package', originIcao, destIcao, planeId: plane.id}` on mouseenter — same full trace as job-list rows PLUS the carrying plane's halo stays lit via the new optional `planeId` field (Map uses `h.planeId ?? ''` for the planes/routes-highlight filters). Mouseleave restores the block's plain `{kind:'plane', id}` highlight; leaving the whole block still ends at null because React fires the child's mouseleave before the parent's
+- **Relocate panel hover previews the planned flight (ISS-027).** The left pane's Relocate section gains `data-testid="relocate-section"` + enter/leave handlers: with a grounded plane AND destination selected it reports `{kind:'route', fromIcao: relocatePlane.locationIcao, toIcao: relocateDest.icao}` (else null), and Map draws the planned trace AND rings ONLY the target airport in airports-highlight (origin stays unmarked — the destination is what the issue asks to see). `HoverTarget` (`components/hoverTypes.ts`) extends to `{kind:'plane';id} | {kind:'package';originIcao;destIcao;planeId?} | {kind:'route';fromIcao;toIcao}`. Existing semantics unchanged: plane hovers filter the three highlight layers exactly as before, package hovers keep BOTH endpoint rings (now plus the trace)
+- **Target airport highlighted in a distinct color on job-list / relocation hover (ISS-022).** The destination of any two-endpoint hover now gets its own ring in a NEW top-most `airports-target-highlight` circle layer (`components/Map.tsx`, same `airports` source and r=9 transparent-fill geometry as airports-highlight, but green `#4ade80` stroke width 3 vs the yellow `#facc15` endpoint rings) — added last in `ensureLayers` so it also sits above the hover-route line at its endpoint; `applyHoverRef` filters it to the destination icao for BOTH `'package'` and `'route'` hovers (empty-string sentinel otherwise). airports-highlight itself is untouched, so the existing both-endpoints / target-only assertions stay valid
+- Tests: unit — new `describe('hoverRouteGeoJson …')` in `lib/mapData.test.ts`: no-hover sentinel → empty; two known airports → one arc with exact dataset endpoints; reversed-input symmetry; missing from/to ICAO → empty (baseline 283 → 288). e2e (`e2e/hover.spec.ts`) — open-package test extended with hover-route endpoint assertions (line geometry first/last coords compared against `/api/airports` lookups) + trace-clear check; new `hovering an on-board cargo row draws its trace and keeps the plane halo` (load via API, hover the row, assert trace endpoints + planes-highlight for that plane, abandon the package afterwards to leave a clean instance); new `hovering the Relocate section previews the planned route and target airport` (selects starter + LEMD via the existing testids, hovers `[data-testid="relocate-section"]`, asserts trace endpoints + target-only ring). New helpers: `airportLonLat(page, icao)` and `expectHoverRoute(page, fromIcao, toIcao)`; all new/extended assertions call `fitToAirports` first since `queryRenderedFeatures` is viewport-scoped
+- Verified: `tsc --noEmit` clean; unit suite green locally (288); `npx playwright test --list` = 41 tests (was 39, +2 new in hover.spec.ts); e2e not run locally by design — CI verifies against an isolated stack
+- **Fix: hover-route e2e timeouts (CI run #69).** All three trace tests failed at `expectHoverRoute` with the 15 s "waiting for the hover-route line EDDF → LEMD" timeout although the dashed trace WAS drawn correctly — the helper assumed `queryRenderedFeatures(undefined, {layers:['hover-route']})` returns exactly one feature whose endpoints are bit-identical to the `/api/airports` dataset coords. MapLibre GL JS stores GeoJSON geometry in per-tile INTEGER grids (`Math.round(extent·(x·2^z − tx))`, maplibre-gl 6.10) and clips long lines across tiles, so a 1420 km leg comes back as one feature PER intersecting tile (empirically 4 at z=4 / 5 at z=5 for EDDF→LEMD, verified against the installed build's GeoJSONVT) with endpoints quantized by up to ~half a grid step (~0.001° observed at z≥4, ~0.02° worst case at z=0): both the `feats.length !== 1` guard and the strict `===` coordinate comparisons could never be true. The helper now accepts any number of segments and matches endpoints within 0.05° (~5 km — above worst-case quantization at any zoom, below the distance between any two EU airports): some segment must start at origin and some end at destination; all other assertions unchanged. App side verified correct (no race: `ensureLayers` awaits the airport fetch before creating sources/layers and re-applies hover afterwards; layer/source ids match) — no app changes
+- **Fix: hover-route e2e — evaluate maplibre geometry in-page before Playwright serialization (CI runs #69–#71).** All three trace tests failed for a serialization reason, not a data one: `renderedFeatures` returned live `GeoJSONFeature` instances from `queryRenderedFeatures`, whose `geometry` is a lazy PROTOTYPE getter — and Playwright's evaluate serialization copies only own enumerable properties (verified empirically), so every feature arrived in test context WITHOUT geometry. Run #69 timed out on the strict length guard before touching it, run #70 threw `TypeError: Cannot read properties of undefined (reading 'coordinates')`, run #71's defensive filter found nothing and timed out. The helper now maps each feature to a plain object inside page.evaluate so the getter is evaluated in-page; the endpoint-matching predicate keeps its degenerate-segment filter as belt-and-braces — no app changes
+
+## v0.21.0 — 2026-09-19 21:01
+- **Relocate panel moves to the left pane (ISS-023).** Flying an empty/grounded plane to another airport is "anything with our plane", so it belongs in the left pane, not as a market row on the right. The `.market-row.market-row-relocate` JSX (`relocate-plane` select of grounded planes labeled `{planeName} — {icao}`, `relocate-dest` name-sorted select, `relocate-go` button → `POST /api/planes/{id}/fly {destIcao}`) moved verbatim from `components/RightPane.tsx` into a new "Relocate" `<section>` in `components/LeftPane.tsx`, inserted between On board and Time. Its state (`relocatePlaneId` / `relocateDestIcao`) and the one-time `/api/airports` fetch (promise-ref pattern, GeoJSON → `{name, icao}[]` sorted by name) moved with it — the relocate-dest select was that fetch's only consumer in RightPane, so nothing else there changed. Busy gating rewired from RightPane's `busy` to LeftPane's own `useGameAction` instance (`actionsBusy`); a grounded-plane filter was added next to the existing `onboard` compute; plane labels reuse the expression already inlined in the Fleet rows. Testids kept byte-identical (`relocate-plane` / `relocate-dest` / `relocate-go`) and the row keeps its `.market-row market-row-relocate` classes (global CSS, works in the 360 px left pane); stale "280 px right pane" comment updated in `app/globals.css`. The map-popup relocation controls (`airport-popup-*`, Map.tsx) are a separate surface fed by the snapshot only — untouched
+- Tests: e2e — only `relocation.spec.ts` touches these testids and all locators are global, so no locator changes; the first test's title (which mentioned "right pane") and the file header comments now say left-pane Relocate section. No unit-test changes (baseline 283)
+- Verified: `tsc --noEmit` clean; unit suite green locally; e2e not run locally by design — CI verifies against an isolated stack
+
+## v0.20.0 — 2026-09-19 19:21
+- **On board moved to the left pane (ISS-021).** The "On board" section (per-plane blocks with loaded/expired cargo rows, Refuel-for-leg / Fly-to / Abandon + penalty preview) now renders in `components/LeftPane.tsx` between Fleet and Time — wallet stays on top. The JSX moved verbatim (same testids: `onboard-{planeId}`, `onboard-package-{pkg.id}`, `refuel-for-*`, `fly-to-*`, `abandon-*` + penalty preview), along with the `onboard` computation (`planes.filter(flying || slotsUsedFor > 0)`) and per-plane cargo filter. All onboard e2e locators are global testids, so existing specs work unchanged
+- **Left pane widened: grid swapped to 360/1fr/280.** `.app-shell` in `app/globals.css` goes from `280px minmax(0, 1fr) 360px` to `360px minmax(0, 1fr) 280px` — total fixed width stays 640 px, so the map column is pixel-identical (map.spec.ts clicks via dynamic `map.project()`). Stale comments updated (on-board blocks now in the left pane; Relocate row comment reflects the 280 px right pane)
+- **Shared action runner hook.** RightPane's local `runAction` (busy gate, inline pane error + shell toast on failure, full post-action snapshot pushed via `applySnapshot`) extracted to new `lib/useGameAction.ts`: `useGameAction(state, applySnapshot, onError) → { runAction, busy, actionError }`, exact semantics kept incl. the non-2xx throw/catch and inline-error auto-clear on the next snapshot. Used in BOTH panes; LeftPane receives `applySnapshot` from the shell (`app/page.tsx`). RightPane keeps `[data-testid="right-error"]`; LeftPane gains a matching `[data-testid="left-action-error"]`. Pure helpers `slotsUsedFor` / `loadEligiblePlanes` stay exported from RightPane (unit tests import them there; LeftPane imports `slotsUsedFor` from it); the Market Relocate row + `/api/airports` fetch stay in RightPane
+- Tests: e2e — `panes.spec.ts` first test now also asserts the "On board" heading is visible inside `[data-testid="left-pane"]` and absent from the right pane; stale header comments updated in `actions.spec.ts` / `right-pane.spec.ts`. No unit-test changes (baseline 283)
+- Verified: `tsc --noEmit` clean; unit suite green locally; e2e not run locally by design — CI verifies against an isolated stack
+- **On-board cargo rows are two lines (ISS-028).** Each `onboard-package-*` row now stacks a full-width "Fly to <airport>" button on its own line above Refuel + Abandon side by side: `components/LeftPane.tsx` moves the fly-to button out of `.contract-main` into the row root and wraps refuel-for + abandon in a new `.onboard-actions` div — all testids, label text, penalty preview and disabled states unchanged. Long destination names in the fly-to label truncate with an ellipsis instead of overflowing: the label's inner span gets `min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap`, full name preserved via a `title` attribute (CSS in `app/globals.css`: `.onboard-block .contract-row` becomes flex-column, new `.onboard-fly-btn` / `.onboard-fly-label` / `.onboard-actions`). No e2e changes — specs locate everything by testid and assert no layout or button order; no version bump (part 2 of v0.20.0)
+
+## v0.19.2 — 2026-09-19 20:06
+- **AGENTS.md "Change process" item 1** — connected issues/tasks that reference the same part of code may now be done together on one branch/PR with a single version bump (e.g. two UI tweaks to the same panel)
+- **AGENTS.md "E2E tests" section rewritten to match current reality** — e2e runs ONLY in CI, against an isolated docker stack inside dind (`docker-compose.ci.yml`); there are NO local e2e runs at all (local verification = `tsc --noEmit` + `npx vitest run` + `npx playwright test --list`; the full suite is verified by CI on every PR). Dropped the stale local-run instructions (deploying to the Traefik-routed instance before testing, driving browsers through the remote Playwright server at 192.168.1.4:3000); kept and reworded the CI env vars that actually exist in `playwright.config.ts` (`E2E_BASE_URL`, `E2E_DEPLOY_CMD`, `PW_REMOTE_BROWSER=0`, `E2E_COMPOSE_ARGS`)
+
+## v0.19.1 — 2026-09-19 18:48
+- AGENTS.md: document that CI-green is enforced on master by branch protection (required status check) and that merges use auto-merge (`merge_when_checks_succeed`) so PRs merge automatically once CI passes
+
 ## v0.19.0 — 2026-09-19 18:05
 - **Auto-slow to 1× when all planes have landed (ISS-011).** When the last plane in flight lands, the sim slows down on its own so an idle fleet doesn't sit at 1000×. Server-side and authoritative: `tickOnce` (`lib/sim/engine.ts`) now remembers how many planes `deliverPackages` finalized during a tick, and when ≥1 plane landed this tick AND no plane remains with status `'flying'` AND the sim is not paused, it persists `timeScale = 1` on the same `sim_state` write as the clock — so the UI slider reflects it on the very next snapshot (no API or OpenAPI change: timeScale is still set via the existing `POST /api/sim`, and `clampTimeScale` semantics are untouched since 1 is a valid ladder value)
 - **Arrival-triggered, not idle-enforced.** The trigger fires only on the tick that processes a landing — a grounded fleet at high scale with no flight ever happening is left alone (this keeps the existing slider e2e in `panes.spec.ts` green: it sets 1000× and expects the server to confirm it while nothing is flying). Paused state is untouched: while paused no landings are processed, so a paused sim never auto-slows
@@ -102,10 +102,12 @@ body {
  color: #334155;
 }

-/* v0.9.0 — single-screen 3-pane shell: left Assets / center map / right Jobs & Market */
+/* v0.9.0 — single-screen 3-pane shell: left Assets / center map / right Jobs & Market.
+   ISS-021 (v0.20.0): left widened to 360px (it now carries the On board section), right
+   narrowed to 280px — total fixed width stays 640px, so the map column is unchanged. */
 .app-shell {
  display: grid;
-  grid-template-columns: 280px minmax(0, 1fr) 360px;
+  grid-template-columns: 360px minmax(0, 1fr) 280px;
  height: 100%;
 }

@@ -362,7 +364,7 @@ body {
 }

 /* ISS-010 (v0.18.0) — the Relocate row carries TWO selects, so let it wrap instead of
-   squeezing both below their readable width in the 360 px pane. */
+   squeezing both below their readable width in the 360 px left pane (moved there in ISS-023 v0.21.0). */
 .market-row-relocate {
  flex-wrap: wrap;
 }
@@ -374,7 +376,7 @@ body {
  font-variant-numeric: tabular-nums;
 }

-/* v0.12.0 — on-board blocks (per plane) in the right pane */
+/* v0.12.0 — on-board blocks (per plane); moved to the left pane in ISS-021 (v0.20.0) */
 .onboard-block {
  background: rgba(30, 41, 59, 0.6);
  border-radius: 6px;
@@ -382,10 +384,36 @@ body {
  margin-bottom: 8px;
 }

+/* ISS-028 (v0.20.0 part 2) — on-board cargo rows are two lines: a full-width fly-to button,
+   then refuel + abandon side by side below it; long destination names truncate with an ellipsis. */
 .onboard-block .contract-row {
  background: transparent;
  padding: 6px 0 0;
  border-top: 1px solid rgba(148, 163, 184, 0.2);
+  display: flex;
+  flex-direction: column;
+  gap: 5px;
+}
+
+.onboard-block .contract-row .contract-sub {
+  margin-top: 0; /* row spacing comes from the container's gap */
+}
+
+.onboard-fly-btn {
+  width: 100%;
+}
+
+.onboard-fly-label {
+  display: block;
+  min-width: 0;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.onboard-actions {
+  display: flex;
+  gap: 6px;
 }

 /* v0.17.0 — ISS-008: bottom-right toast stack (action errors + game events) */
@@ -43,7 +43,9 @@ export default function Home() {

  return (
    <div className="app-shell">
-      <LeftPane state={state} loading={loading} error={error} onRefresh={refresh} onHover={setHovered} onError={onError} />
+      {/* ISS-021 (v0.20.0) — applySnapshot also reaches the left pane: its On board section's
+          refuel/fly/abandon actions push their response snapshot into the shared state */}
+      <LeftPane state={state} loading={loading} error={error} onRefresh={refresh} applySnapshot={applySnapshot} onHover={setHovered} onError={onError} />
      {/* v0.11.0 — the same polled snapshot drives the map's plane markers + route lines;
          ISS-010 (v0.18.0) — applySnapshot lets the airport popup's Relocate row push its
          action response into the shared state, exactly like RightPane does */}
@@ -1,11 +1,15 @@
 'use client';

 import { useCallback, useEffect, useRef, useState, type ChangeEvent } from 'react';
+import type { GeoJsonFeatureCollection } from '@/lib/airports';
 import type { PlaneState, StateSnapshot } from '@/lib/game/state';
 import { PLANE_TYPES } from '@/lib/game/catalog';
-import { formatCash, formatFuel, formatSimClock } from '@/lib/format';
+import { abandonPenalty } from '@/lib/game/penalty';
+import { formatCash, formatDeadlineRelative, formatFuel, formatSimClock } from '@/lib/format';
 import { TIME_SCALES, scaleToSlider, sliderToScale } from '@/lib/timeScale';
+import { useGameAction } from '@/lib/useGameAction';
 import { useSimClock } from '@/lib/useSimClock';
+import { slotsUsedFor } from './RightPane';
 import type { HoverTarget } from './hoverTypes';

 interface LeftPaneProps {
@@ -14,6 +18,9 @@ interface LeftPaneProps {
  error: string | null;
  // The shell's single-poll refresh — called after a sim-control POST so the pane updates immediately.
  onRefresh: () => void;
+  // ISS-021 (v0.20.0): push the full snapshot returned by an action endpoint into the shared shell
+  // state — needed now that the On board section's refuel/fly/abandon actions live in this pane.
+  applySnapshot: (snapshot: StateSnapshot) => void;
  // ISS-002 (v0.15.0): report fleet-row hovers to the shell so the map can highlight the plane.
  onHover: (target: HoverTarget | null) => void;
  // ISS-008 (v0.17.0): report a failed sim-control POST to the shell as an error toast.
@@ -83,9 +90,40 @@ export async function retrySimPost(
  return { ok: false, reason: 'exhausted', error: lastError };
 }

-export default function LeftPane({ state, loading, error, onRefresh, onHover, onError }: LeftPaneProps) {
+export default function LeftPane({ state, loading, error, onRefresh, applySnapshot, onHover, onError }: LeftPaneProps) {
  const [busy, setBusy] = useState(false);

+  // ISS-021 (v0.20.0): shared action runner for the On board section (moved here from RightPane).
+  const { runAction, busy: actionsBusy, actionError } = useGameAction(state, applySnapshot, onError);
+
+  // ISS-023 (v0.21.0): Relocate selections — moved here from the right-pane market row; same
+  // "effective selection" pattern as there: the user's pick while it stays valid, else a sensible
+  // default (first grounded plane / first airport).
+  const [relocatePlaneId, setRelocatePlaneId] = useState<string | null>(null);
+  const [relocateDestIcao, setRelocateDestIcao] = useState<string | null>(null);
+
+  // ISS-010 (v0.18.0): one-time /api/airports fetch per page life — destination options for the
+  // Relocate section, sorted by name so e2e selection is stable. Same promise-ref pattern as Map.tsx;
+  // on failure airportOptions stays null and the Relocate button simply remains disabled. Moved here
+  // from RightPane in ISS-023 (v0.21.0) — the relocate-dest select was its only consumer there.
+  const [airportOptions, setAirportOptions] = useState<Array<{ name: string; icao: string }> | null>(null);
+  const airportsPromiseRef = useRef<Promise<Array<{ name: string; icao: string }>> | null>(null);
+  useEffect(() => {
+    if (!airportsPromiseRef.current) {
+      airportsPromiseRef.current = fetch('/api/airports', { cache: 'no-store' })
+        .then((res) => {
+          if (!res.ok) throw new Error(`GET /api/airports → HTTP ${res.status}`);
+          return res.json() as Promise<GeoJsonFeatureCollection>;
+        })
+        .then((fc) =>
+          fc.features
+            .map((f) => ({ name: f.properties.name, icao: f.properties.icao }))
+            .sort((a, b) => a.name.localeCompare(b.name, 'en')),
+        );
+    }
+    void airportsPromiseRef.current.then(setAirportOptions).catch(() => {});
+  }, []);
+
  // POST /api/sim (retried up to SIM_POST_MAX_ATTEMPTS× on failure — CI runs #44/#47), then
  // refetch the full snapshot immediately so the pane reflects the new controls without waiting
  // for the next poll tick. After the final attempt fails keep the stale UI and surface an error
@@ -153,6 +191,20 @@ export default function LeftPane({ state, loading, error, onRefresh, onHover, on
  const paused = state?.simState.paused ?? false;
  const timeScale = state?.simState.timeScale ?? 1;

+  // On board (v0.12.0, moved from the right pane in ISS-021 v0.20.0): every plane that carries
+  // cargo or is mid-flight gets a block — its loaded/expired packages with fly-to-destination +
+  // abandon controls, and flying planes show their current leg.
+  const clockMs = state?.simState.clockMs ?? 0;
+  const onboard = state ? state.planes.filter((p) => p.status === 'flying' || slotsUsedFor(state, p.id) > 0) : [];
+
+  // ISS-023 (v0.21.0): Relocate — any GROUNDED plane can be repositioned to any airport via the
+  // existing fly endpoint (pure repositioning, no package needed since v0.12.0). Moved here from
+  // the right-pane market row; with state null both fall back to null and the section isn't rendered.
+  const grounded = state ? state.planes.filter((p) => p.status === 'available') : [];
+  const relocatePlane = grounded.find((p) => p.id === relocatePlaneId) ?? grounded[0] ?? null;
+  const relocateDest =
+    airportOptions === null ? null : airportOptions.find((a) => a.icao === relocateDestIcao) ?? airportOptions[0] ?? null;
+
  // Slider commit (v0.9.1): the displayed value follows the drag optimistically via
  // pendingScale; POST /api/sim fires after a 250 ms debounce, or immediately when the
  // user releases the slider (browsers fire a native 'change' on release). The server's
@@ -294,6 +346,167 @@ export default function LeftPane({ state, loading, error, onRefresh, onHover, on
            )}
          </section>

+          {/* ISS-021 (v0.20.0): moved here from the right pane — between Fleet and Time. */}
+          <section className="pane-section">
+            <h3 className="pane-heading">On board</h3>
+            {onboard.length === 0 ? (
+              <p className="pane-muted">Nothing on board.</p>
+            ) : (
+              onboard.map((plane) => {
+                const cargo = state.packages.filter(
+                  (pkg) => pkg.planeId === plane.id && (pkg.status === 'loaded' || pkg.status === 'expired'),
+                );
+                return (
+                  // ISS-002: hovering the on-board block (including its cargo rows) highlights the plane.
+                  // Handlers live only on the outer div — React's enter/leave don't fire when moving to a
+                  // child, so this covers the whole block without flicker between sub-elements.
+                  <div
+                    key={plane.id}
+                    data-testid={`onboard-${plane.id}`}
+                    className="onboard-block"
+                    onMouseEnter={() => onHover({ kind: 'plane', id: plane.id })}
+                    onMouseLeave={() => onHover(null)}
+                  >
+                    <div className="contract-main">
+                      <span className="plane-model">{PLANE_TYPES[plane.model]?.name ?? plane.model}</span>
+                      {plane.status === 'flying' ? (
+                        <>
+                          <span className="plane-status status-flying">in flight</span>
+                          {plane.destName && (
+                            <span data-testid={`plane-leg-${plane.id}`} className="contract-route">
+                              {plane.locationName} → {plane.destName}
+                            </span>
+                          )}
+                        </>
+                      ) : (
+                        <span className="plane-status status-available">{plane.locationIcao}</span>
+                      )}
+                    </div>
+                    {cargo.map((pkg) => {
+                      const penalty = abandonPenalty(pkg, clockMs);
+                      return (
+                        // ISS-025 (v0.22.0): hovering a loaded package draws its full origin→dest trace on the map —
+                        // same as job-list rows — and keeps this plane's halo lit via planeId. Leaving the row restores
+                        // the block's plain plane highlight; leaving the whole block still ends at null (the child's
+                        // mouseleave fires before the parent's).
+                        <div
+                          key={pkg.id}
+                          data-testid={`onboard-package-${pkg.id}`}
+                          className="contract-row"
+                          onMouseEnter={() => onHover({ kind: 'package', originIcao: pkg.originIcao, destIcao: pkg.destIcao, planeId: plane.id })}
+                          onMouseLeave={() => onHover({ kind: 'plane', id: plane.id })}
+                        >
+                          <button
+                            type="button"
+                            data-testid={`fly-to-${pkg.id}`}
+                            className="pane-btn onboard-fly-btn"
+                            disabled={actionsBusy || plane.status !== 'available'}
+                            onClick={() => void runAction(`/api/planes/${plane.id}/fly`, { destIcao: pkg.destIcao })}
+                          >
+                            <span className="onboard-fly-label" title={`Fly to ${pkg.destName}`}>
+                              Fly to {pkg.destName}
+                            </span>
+                          </button>
+                          <div className="onboard-actions">
+                            <button
+                              type="button"
+                              data-testid={`refuel-for-${pkg.id}`}
+                              className="pane-btn"
+                              disabled={actionsBusy || plane.status !== 'available'}
+                              onClick={() => void runAction(`/api/planes/${plane.id}/refuel`, { mode: 'forFlight', packageId: pkg.id })}
+                            >
+                              Refuel
+                            </button>
+                            <button
+                              type="button"
+                              data-testid={`abandon-${pkg.id}`}
+                              className="pane-btn"
+                              disabled={actionsBusy || plane.status !== 'available'}
+                              onClick={() => void runAction(`/api/packages/${pkg.id}/abandon`)}
+                            >
+                              Abandon{' '}
+                              <span data-testid={`abandon-penalty-${pkg.id}`}>−{formatCash(penalty)}</span>
+                            </button>
+                          </div>
+                          <div className="contract-sub">
+                            <span className="contract-route">{pkg.originName} → {pkg.destName}</span>
+                            <span>{formatCash(pkg.reward)}</span>
+                            {pkg.status === 'expired' ? (
+                              <span data-testid={`onboard-expired-${pkg.id}`}>expired</span>
+                            ) : (
+                              <span>{formatDeadlineRelative(pkg.deadlineSimTime, clockMs)}</span>
+                            )}
+                          </div>
+                        </div>
+                      );
+                    })}
+                  </div>
+                );
+              })
+            )}
+          </section>
+
+          {/* ISS-023 (v0.21.0): moved here from the right-pane market row — it belongs with
+              everything else about our planes, between On board and Time. */}
+          {/* ISS-027 (v0.22.0): hovering the section previews the planned relocation on the map —
+              dashed trace from the selected plane's airport to the destination + a ring on the target.
+              With no grounded plane or no loaded airport options there is nothing to preview → null. */}
+          <section
+            className="pane-section"
+            data-testid="relocate-section"
+            onMouseEnter={() =>
+              onHover(
+                relocatePlane && relocateDest
+                  ? { kind: 'route', fromIcao: relocatePlane.locationIcao, toIcao: relocateDest.icao }
+                  : null,
+              )
+            }
+            onMouseLeave={() => onHover(null)}
+          >
+            <h3 className="pane-heading">Relocate</h3>
+            {/* ISS-010 (v0.18.0): relocate a grounded plane — the fly endpoint already allows pure
+                repositioning, this row just exposes it for planes with nothing on board. */}
+            <div className="market-row market-row-relocate">
+              <select
+                data-testid="relocate-plane"
+                aria-label="Plane to relocate"
+                value={relocatePlane?.id ?? ''}
+                onChange={(e) => setRelocatePlaneId(e.target.value || null)}
+              >
+                {grounded.map((p) => (
+                  <option key={p.id} value={p.id}>
+                    {PLANE_TYPES[p.model]?.name ?? p.model} — {p.locationIcao}
+                  </option>
+                ))}
+              </select>
+              <select
+                data-testid="relocate-dest"
+                aria-label="Relocation destination airport"
+                value={relocateDest?.icao ?? ''}
+                onChange={(e) => setRelocateDestIcao(e.target.value || null)}
+              >
+                {airportOptions?.map((a) => (
+                  <option key={a.icao} value={a.icao}>
+                    {a.name}
+                  </option>
+                ))}
+              </select>
+              <button
+                type="button"
+                data-testid="relocate-go"
+                className="pane-btn"
+                disabled={actionsBusy || relocatePlane === null || relocateDest === null}
+                onClick={() => {
+                  if (relocatePlane && relocateDest) {
+                    void runAction(`/api/planes/${relocatePlane.id}/fly`, { destIcao: relocateDest.icao });
+                  }
+                }}
+              >
+                Relocate
+              </button>
+            </div>
+          </section>
+
          <section className="pane-section">
            <h3 className="pane-heading">Time</h3>
            <p data-testid="sim-clock" className="sim-clock">
@@ -347,6 +560,8 @@ export default function LeftPane({ state, loading, error, onRefresh, onHover, on
              {error}
            </p>
          )}
+          {/* ISS-021 (v0.20.0): inline error from a failed On board action — mirrors right-error. */}
+          {actionError && <p data-testid="left-action-error" className="pane-error">{actionError}</p>}
        </>
      ) : null}
    </aside>
@@ -8,7 +8,7 @@ import { DEFAULT_STYLE_ID, STYLES, STYLE_STORAGE_KEY, isStyleId, localAssetsAvai
 import type { GeoJsonFeatureCollection } from '../lib/airports';
 import type { StateSnapshot } from '../lib/game/state';
 import type { HoverTarget } from './hoverTypes';
-import { planesGeoJson, routesGeoJson, type AirportCoord, type PlaneFeatureProps } from '../lib/mapData';
+import { hoverRouteGeoJson, planesGeoJson, routesGeoJson, type AirportCoord, type PlaneFeatureProps } from '../lib/mapData';
 import { weatherFor } from '../lib/weather';
 import { approxLocalTime } from '../lib/localTime';

@@ -33,6 +33,15 @@ const ROUTES_LEGS_LAYER_ID = 'routes-legs';
 const PLANES_HIGHLIGHT_LAYER_ID = 'planes-highlight';
 const ROUTES_HIGHLIGHT_LAYER_ID = 'routes-highlight';
 const AIRPORTS_HIGHLIGHT_LAYER_ID = 'airports-highlight';
+// ISS-022/025/027 (v0.22.0): the hover route trace — its OWN source + top-most dashed line,
+// because the shared `routes` source only holds FLYING legs: an open package's or a grounded
+// relocation's planned route is never in it. applyHoverRef pushes data into it on every hover.
+const HOVER_ROUTES_SOURCE_ID = 'hover-routes';
+const HOVER_ROUTE_LAYER_ID = 'hover-route';
+// ISS-022 (v0.22.0): the DESTINATION airport's ring — a second, differently-colored circle over
+// the same `airports` source so the target stands out from the origin's plain yellow ring.
+// applyHoverRef filters it to the hovered target's destination icao only.
+const AIRPORTS_TARGET_HIGHLIGHT_LAYER_ID = 'airports-target-highlight';

 function escapeHtml(s: string): string {
  return s.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
@@ -43,7 +52,8 @@ interface MapProps {
  // route lines. Null until the first successful poll.
  state?: StateSnapshot | null;
  // ISS-002 (v0.15.0): the side panels' hover target — highlights the matching plane
-  // (+ its route leg if flying) or a package's endpoint airports. Null = nothing hovered.
+  // (+ its route leg if flying) or a package's endpoint airports, and (ISS-022/025/027 v0.22.0)
+  // draws the full great-circle trace between any hovered target's two endpoints. Null = nothing hovered.
  hovered?: HoverTarget | null;
  // ISS-010 (v0.18.0): push an action endpoint's full response snapshot into the shared
  // shell state — same callback RightPane receives, used by the airport popup's Relocate row.
@@ -101,22 +111,49 @@ export default function FlightMap({ state, hovered, applySnapshot }: MapProps) {
    const map = mapRef.current;
    if (!map) return;
    const h = hoveredRef.current;
-    // The empty-string sentinel matches nothing: no feature has id/icao ''.
-    const planeId = h && h.kind === 'plane' ? h.id : '';
+    // The empty-string sentinel matches nothing: no feature has id/icao ''. A package hover may
+    // name its plane (ISS-025 on-board cargo rows), so that plane's halo stays lit too.
+    let planeId = '';
+    let fromIcao = '';
+    let toIcao = '';
+    if (h) {
+      if (h.kind === 'plane') planeId = h.id;
+      else if (h.kind === 'package') {
+        planeId = h.planeId ?? '';
+        fromIcao = h.originIcao;
+        toIcao = h.destIcao;
+      } else {
+        // 'route' — the Relocate panel's planned flight: trace + target airport only.
+        fromIcao = h.fromIcao;
+        toIcao = h.toIcao;
+      }
+    }
    if (map.getLayer(PLANES_HIGHLIGHT_LAYER_ID)) {
      map.setFilter(PLANES_HIGHLIGHT_LAYER_ID, ['==', ['get', 'id'], planeId]);
    }
    if (map.getLayer(ROUTES_HIGHLIGHT_LAYER_ID)) {
      map.setFilter(ROUTES_HIGHLIGHT_LAYER_ID, ['==', ['get', 'planeId'], planeId]);
    }
-    const originIcao = h && h.kind === 'package' ? h.originIcao : '';
-    const destIcao = h && h.kind === 'package' ? h.destIcao : '';
+    // ISS-022/025/027: the hover route trace — one great-circle line for any target carrying two
+    // ICAOs (package origin→dest / relocate fromIcao→toIcao); empty when either endpoint is unknown.
+    const hoverSource = map.getSource(HOVER_ROUTES_SOURCE_ID) as maplibregl.GeoJSONSource | undefined;
+    if (hoverSource) {
+      void hoverSource.setData(hoverRouteGeoJson(fromIcao, toIcao, airportsIndexRef.current ?? new Map()));
+    }
+    // Package hovers ring BOTH endpoints (v0.15.0 behavior); 'route' hovers ring the TARGET only —
+    // the relocation's destination is what ISS-027 asks to see. Plane hovers ring nothing.
+    const originIcao = h?.kind === 'package' ? fromIcao : '';
+    const destIcao = h?.kind === 'package' || h?.kind === 'route' ? toIcao : '';
    if (map.getLayer(AIRPORTS_HIGHLIGHT_LAYER_ID)) {
      map.setFilter(
        AIRPORTS_HIGHLIGHT_LAYER_ID,
        ['any', ['==', ['get', 'icao'], originIcao], ['==', ['get', 'icao'], destIcao]],
      );
    }
+    // ISS-022: the destination gets its own distinct-colored ring on top (package AND route hovers).
+    if (map.getLayer(AIRPORTS_TARGET_HIGHLIGHT_LAYER_ID)) {
+      map.setFilter(AIRPORTS_TARGET_HIGHLIGHT_LAYER_ID, ['==', ['get', 'icao'], destIcao]);
+    }
  };

  useEffect(() => {
@@ -384,6 +421,41 @@ export default function FlightMap({ state, hovered, applySnapshot }: MapProps) {
            },
          });
        }
+        // ISS-022/025/027 (v0.22.0): the hover route trace — added LAST so it sits above every
+        // other layer, including the highlight rings at its endpoints. Own source: the shared
+        // `routes` source only holds flying legs, never a planned one. Empty until a hover sets data.
+        if (!map.getSource(HOVER_ROUTES_SOURCE_ID)) {
+          map.addSource(HOVER_ROUTES_SOURCE_ID, { type: 'geojson', data: { type: 'FeatureCollection', features: [] } });
+        }
+        if (!map.getLayer(HOVER_ROUTE_LAYER_ID)) {
+          map.addLayer({
+            id: HOVER_ROUTE_LAYER_ID,
+            type: 'line',
+            source: HOVER_ROUTES_SOURCE_ID,
+            paint: {
+              'line-color': '#facc15', // matches the airports-highlight ring — one "trace" color
+              'line-width': 4,
+              'line-dasharray': [2, 2], // dashed = planned route, distinct from solid flying legs
+            },
+          });
+        }
+        // ISS-022 (v0.22.0): the destination's ring — same geometry as airports-highlight but a
+        // DIFFERENT color so the target stands out over the origin's yellow ring; added last so it
+        // also sits above the hover-route line at its endpoint. Starts filtered to match nothing.
+        if (!map.getLayer(AIRPORTS_TARGET_HIGHLIGHT_LAYER_ID)) {
+          map.addLayer({
+            id: AIRPORTS_TARGET_HIGHLIGHT_LAYER_ID,
+            type: 'circle',
+            source: AIRPORTS_SOURCE_ID,
+            filter: ['==', ['get', 'icao'], ''],
+            paint: {
+              'circle-radius': 9, // same ring size as airports-highlight (r=5 base circles)
+              'circle-color': 'rgba(0, 0, 0, 0)', // transparent fill — stroke-only ring
+              'circle-stroke-width': 3,
+              'circle-stroke-color': '#4ade80', // green — distinct from the yellow endpoint rings
+            },
+          });
+        }
        // Layer-scoped listeners survive setStyle (they filter by layer id at event
        // time), so off+on with the same reference re-wires without duplicating.
        map.off('click', AIRPORTS_LAYER_ID, onAirportClick);
@@ -1,11 +1,10 @@
 'use client';

-import { useCallback, useEffect, useRef, useState } from 'react';
-import type { GeoJsonFeatureCollection } from '@/lib/airports';
+import { useState } from 'react';
 import type { PackageState, PlaneState, StateSnapshot } from '@/lib/game/state';
 import { PLANE_TYPES } from '@/lib/game/catalog';
-import { abandonPenalty } from '@/lib/game/penalty';
 import { formatCash, formatDeadlineRelative } from '@/lib/format';
+import { useGameAction } from '@/lib/useGameAction';
 import type { HoverTarget } from './hoverTypes';

 interface RightPaneProps {
@@ -109,13 +108,9 @@ function LoadControls({
 }

 export default function RightPane({ state, loading, applySnapshot, onHover, onError }: RightPaneProps) {
-  const [busy, setBusy] = useState(false);
-  // Inline error from a failed action — auto-clears on the next successful poll (the shell's
-  // snapshot prop changes every tick) or the next successful action.
-  const [actionError, setActionError] = useState<string | null>(null);
-  useEffect(() => {
-    if (state !== null) setActionError(null);
-  }, [state]);
+  // ISS-021 (v0.20.0): shared action runner — busy gate, inline pane error + shell toast on
+  // failure, full post-action snapshot pushed into the shared state on success.
+  const { runAction, busy, actionError } = useGameAction(state, applySnapshot, onError);

  // Market picker selections — same "effective selection" pattern as LoadControls: the
  // user's pick while it stays valid, else a sensible default (first catalog entry / first plane).
@@ -123,61 +118,8 @@ export default function RightPane({ state, loading, applySnapshot, onHover, onEr
  const [sellPlaneId, setSellPlaneId] = useState<string | null>(null);
  const [refuelPlaneId, setRefuelPlaneId] = useState<string | null>(null);

-  // ISS-010 (v0.18.0): Relocate row selections — same "effective selection" pattern as the rows above:
-  // the user's pick while it stays valid, else a sensible default (first grounded plane / first airport).
-  const [relocatePlaneId, setRelocatePlaneId] = useState<string | null>(null);
-  const [relocateDestIcao, setRelocateDestIcao] = useState<string | null>(null);
-
-  // ISS-010 (v0.18.0): one-time /api/airports fetch per page life — destination options for the
-  // Relocate row, sorted by name so e2e selection is stable. Same promise-ref pattern as Map.tsx;
-  // on failure airportOptions stays null and the Relocate button simply remains disabled.
-  const [airportOptions, setAirportOptions] = useState<Array<{ name: string; icao: string }> | null>(null);
-  const airportsPromiseRef = useRef<Promise<Array<{ name: string; icao: string }>> | null>(null);
-  useEffect(() => {
-    if (!airportsPromiseRef.current) {
-      airportsPromiseRef.current = fetch('/api/airports', { cache: 'no-store' })
-        .then((res) => {
-          if (!res.ok) throw new Error(`GET /api/airports → HTTP ${res.status}`);
-          return res.json() as Promise<GeoJsonFeatureCollection>;
-        })
-        .then((fc) =>
-          fc.features
-            .map((f) => ({ name: f.properties.name, icao: f.properties.icao }))
-            .sort((a, b) => a.name.localeCompare(b.name, 'en')),
-        );
-    }
-    void airportsPromiseRef.current.then(setAirportOptions).catch(() => {});
-  }, []);
-
-  // POST an action endpoint. Every success returns the FULL post-action snapshot (v0.8.0
-  // convention) — pushed into the shared state immediately; a 4xx {error} body becomes the
-  // inline pane error and the stale UI stays until the next poll. Buttons are disabled while
-  // a request is in flight, so at most one action runs at a time.
-  const runAction = useCallback(
-    async (path: string, body?: unknown) => {
-      if (busy) return;
-      setBusy(true);
-      try {
-        const res = await fetch(path, {
-          method: 'POST',
-          headers: { 'Content-Type': 'application/json' },
-          body: body === undefined ? undefined : JSON.stringify(body),
-          cache: 'no-store',
-        });
-        const data = (await res.json()) as StateSnapshot & { error?: string };
-        if (!res.ok) throw new Error(data.error ?? `HTTP ${res.status}`);
-        setActionError(null);
-        applySnapshot(data);
-      } catch (err) {
-        const message = err instanceof Error ? err.message : String(err);
-        setActionError(message); // inline pane error stays…
-        onError?.(message); // …and the shell mirrors it as a bottom-right toast (ISS-008)
-      } finally {
-        setBusy(false);
-      }
-    },
-    [applySnapshot, busy, onError],
-  );
+  // ISS-023 (v0.21.0): the Relocate row moved to the left pane — it belongs with everything else
+  // about our planes, not in the market. Its state + /api/airports fetch went with it.

  if (loading && !state) {
    return (
@@ -192,13 +134,6 @@ export default function RightPane({ state, loading, applySnapshot, onHover, onEr
  const clockMs = state.simState.clockMs;
  const open = state.packages.filter((p) => p.status === 'open');

-  // On board (v0.12.0): every plane that carries cargo or is mid-flight gets a block —
-  // its loaded/expired packages with fly-to-destination + abandon controls, and flying
-  // planes show their current leg.
-  const onboard = state.planes.filter(
-    (p) => p.status === 'flying' || slotsUsedFor(state, p.id) > 0,
-  );
-
  const catalog = state.catalog;
  const buyEntry = catalog.find((e) => e.model === buyModelId) ?? catalog[0] ?? null;

@@ -209,12 +144,6 @@ export default function RightPane({ state, loading, applySnapshot, onHover, onEr
    state.planes.find((p) => p.id === refuelPlaneId && p.status === 'available' && p.fuel < p.maxFuel) ??
    refuelable[0] ??
    null;
-  // ISS-010 (v0.18.0): Relocate — any GROUNDED plane can be repositioned to any airport via the
-  // existing fly endpoint (pure repositioning, no package needed since v0.12.0).
-  const relocatePlane = grounded.find((p) => p.id === relocatePlaneId) ?? grounded[0] ?? null;
-  const relocateDest =
-    airportOptions === null ? null : airportOptions.find((a) => a.icao === relocateDestIcao) ?? airportOptions[0] ?? null;
-
  // Previews computed client-side from the snapshot's catalog + economy constants (v0.10.0).
  const sellEntry = sellPlane ? catalog.find((e) => e.model === sellPlane.model) : undefined;
  const sellPayout = sellEntry ? Math.round(sellEntry.price * state.sellFraction * 100) / 100 : null;
@@ -270,92 +199,7 @@ export default function RightPane({ state, loading, applySnapshot, onHover, onEr
        )}
      </section>

-      <section className="pane-section">
-        <h3 className="pane-heading">On board</h3>
-        {onboard.length === 0 ? (
-          <p className="pane-muted">Nothing on board.</p>
-        ) : (
-          onboard.map((plane) => {
-            const cargo = state.packages.filter(
-              (pkg) => pkg.planeId === plane.id && (pkg.status === 'loaded' || pkg.status === 'expired'),
-            );
-            return (
-              // ISS-002: hovering the on-board block (including its cargo rows) highlights the plane.
-              // Handlers live only on the outer div — React's enter/leave don't fire when moving to a
-              // child, so this covers the whole block without flicker between sub-elements.
-              <div
-                key={plane.id}
-                data-testid={`onboard-${plane.id}`}
-                className="onboard-block"
-                onMouseEnter={() => onHover({ kind: 'plane', id: plane.id })}
-                onMouseLeave={() => onHover(null)}
-              >
-                <div className="contract-main">
-                  <span className="plane-model">{planeName(plane)}</span>
-                  {plane.status === 'flying' ? (
-                    <>
-                      <span className="plane-status status-flying">in flight</span>
-                      {plane.destName && (
-                        <span data-testid={`plane-leg-${plane.id}`} className="contract-route">
-                          {plane.locationName} → {plane.destName}
-                        </span>
-                      )}
-                    </>
-                  ) : (
-                    <span className="plane-status status-available">{plane.locationIcao}</span>
-                  )}
-                </div>
-                {cargo.map((pkg) => {
-                  const penalty = abandonPenalty(pkg, clockMs);
-                  return (
-                    <div key={pkg.id} data-testid={`onboard-package-${pkg.id}`} className="contract-row">
-                      <div className="contract-main">
-                        <button
-                          type="button"
-                          data-testid={`refuel-for-${pkg.id}`}
-                          className="pane-btn"
-                          disabled={busy || plane.status !== 'available'}
-                          onClick={() => void runAction(`/api/planes/${plane.id}/refuel`, { mode: 'forFlight', packageId: pkg.id })}
-                        >
-                          Refuel
-                        </button>
-                        <button
-                          type="button"
-                          data-testid={`fly-to-${pkg.id}`}
-                          className="pane-btn"
-                          disabled={busy || plane.status !== 'available'}
-                          onClick={() => void runAction(`/api/planes/${plane.id}/fly`, { destIcao: pkg.destIcao })}
-                        >
-                          Fly to {pkg.destName}
-                        </button>
-                        <button
-                          type="button"
-                          data-testid={`abandon-${pkg.id}`}
-                          className="pane-btn"
-                          disabled={busy || plane.status !== 'available'}
-                          onClick={() => void runAction(`/api/packages/${pkg.id}/abandon`)}
-                        >
-                          Abandon{' '}
-                          <span data-testid={`abandon-penalty-${pkg.id}`}>−{formatCash(penalty)}</span>
-                        </button>
-                      </div>
-                      <div className="contract-sub">
-                        <span className="contract-route">{pkg.originName} → {pkg.destName}</span>
-                        <span>{formatCash(pkg.reward)}</span>
-                        {pkg.status === 'expired' ? (
-                          <span data-testid={`onboard-expired-${pkg.id}`}>expired</span>
-                        ) : (
-                          <span>{formatDeadlineRelative(pkg.deadlineSimTime, clockMs)}</span>
-                        )}
-                      </div>
-                    </div>
-                  );
-                })}
-              </div>
-            );
-          })
-        )}
-      </section>
+      {/* ISS-021 (v0.20.0): the On board section moved to the left pane (between Fleet and Time). */}

      <section className="pane-section">
        <h3 className="pane-heading">Market</h3>
@@ -455,47 +299,7 @@ export default function RightPane({ state, loading, applySnapshot, onHover, onEr
          </button>
        </div>

-        {/* ISS-010 (v0.18.0): relocate a grounded plane — the fly endpoint already allows pure
-            repositioning, this row just exposes it for planes with nothing on board. */}
-        <div className="market-row market-row-relocate">
-          <select
-            data-testid="relocate-plane"
-            aria-label="Plane to relocate"
-            value={relocatePlane?.id ?? ''}
-            onChange={(e) => setRelocatePlaneId(e.target.value || null)}
-          >
-            {grounded.map((p) => (
-              <option key={p.id} value={p.id}>
-                {planeName(p)} — {p.locationIcao}
-              </option>
-            ))}
-          </select>
-          <select
-            data-testid="relocate-dest"
-            aria-label="Relocation destination airport"
-            value={relocateDest?.icao ?? ''}
-            onChange={(e) => setRelocateDestIcao(e.target.value || null)}
-          >
-            {airportOptions?.map((a) => (
-              <option key={a.icao} value={a.icao}>
-                {a.name}
-              </option>
-            ))}
-          </select>
-          <button
-            type="button"
-            data-testid="relocate-go"
-            className="pane-btn"
-            disabled={busy || relocatePlane === null || relocateDest === null}
-            onClick={() => {
-              if (relocatePlane && relocateDest) {
-                void runAction(`/api/planes/${relocatePlane.id}/fly`, { destIcao: relocateDest.icao });
-              }
-            }}
-          >
-            Relocate
-          </button>
-        </div>
+        {/* ISS-023 (v0.21.0): the Relocate row moved to the left pane's "Relocate" section. */}
      </section>

      {actionError && <p data-testid="right-error" className="pane-error">{actionError}</p>}
@@ -1,7 +1,12 @@
 // ISS-002 — what a side-panel hover highlights on the map (v0.15.0): a plane marker
 // (+ its route leg if flying) or both endpoint airports of an open package. The shell
 // owns this state and passes it to <Map>; panes report it via their onHover callback.
+// ISS-022/025/027 (v0.22.0): any target carrying two ICAOs also makes the map draw the full
+// great-circle trace between them — package hovers carry origin→dest, 'route' hovers (the
+// Relocate panel) carry fromIcao→toIcao; a package hover may additionally name its plane so
+// that plane's halo stays lit alongside the trace.

 export type HoverTarget =
  | { kind: 'plane'; id: string }
-  | { kind: 'package'; originIcao: string; destIcao: string };
+  | { kind: 'package'; originIcao: string; destIcao: string; planeId?: string }
+  | { kind: 'route'; fromIcao: string; toIcao: string };
@@ -3,7 +3,8 @@ import { expect, test } from '@playwright/test';

 // v0.12.0 package model against the live origin (https://flight.dev.kkhost.pl):
 // the full core loop through the UI — hook creates a short package at EDDF → Load
-// via the right pane → click its destination in the on-board list → fly at 1000× →
+// via the right pane → click its destination in the on-board list (left pane since
+// v0.20.0, ISS-021) → fly at 1000× →
 // arrival delivers EXACTLY the reward + rep; abandon deducts exactly the formula
 // penalty while grounded; expired packages deliver/abandon with no reward and no
 // penalty. Mirrors lib/game/penalty.ts for exact-value assertions.
@@ -6,6 +6,10 @@ import { test, expect, type Page } from '@playwright/test';
 // highlight layers (planes-highlight / routes-highlight / airports-highlight), each filtered
 // to match nothing until a hover sets the filter — asserted here via window.__flightMap's
 // queryRenderedFeatures, same pattern as e2e/map.spec.ts and e2e/map-interactions.spec.ts.
+// ISS-022/025/027 (v0.22.0): any hover carrying two endpoints ALSO draws the full great-circle
+// trace between them in a fourth top-most layer (`hover-route`, dashed) — job-list rows, on-board
+// cargo rows and the Relocate section; the relocate preview rings only its TARGET airport, which
+// additionally gets a distinct green ring in `airports-target-highlight` (ISS-022).

 const SCALE = 1000; // fastest sim speed (v0.14.0 ladder top) — keeps flights to seconds of real time
 const HUB = 'EDDF'; // must match HUB_ICAO in lib/game/seed.ts
@@ -113,12 +117,30 @@ async function waitForAirportCount(page: Page): Promise<void> {
 }

 // Rendered features of the given layers in the current viewport, [] until the map exists.
-function renderedFeatures(page: Page, layers: string[]) {
+function renderedFeatures(
+  page: Page,
+  layers: string[],
+): Promise<Array<{ type?: unknown; id?: unknown; properties?: unknown; geometry?: unknown }>> {
  return page.evaluate((ls: string[]) => {
    const m = (window as any).__flightMap;
    if (!m) return [];
    try {
-      return m.queryRenderedFeatures(undefined, { layers: ls });
+      // queryRenderedFeatures returns live GeoJSONFeature instances whose `geometry` is a lazy
+      // PROTOTYPE getter — Playwright's evaluate serialization copies only own enumerable props,
+      // so geometry silently vanishes across the page boundary (CI runs #69–#71: strict-equality
+      // timeouts → TypeError on f.geometry.coordinates → filter-found-nothing timeouts). Map to
+      // plain objects IN-PAGE so the getter is evaluated before serialization.
+      return (m.queryRenderedFeatures(undefined, { layers: ls }) as Array<{
+        type?: unknown;
+        id?: unknown;
+        properties?: unknown;
+        geometry?: unknown;
+      }>).map((f) => ({
+        type: f.type,
+        id: f.id,
+        properties: f.properties,
+        geometry: f.geometry,
+      }));
    } catch {
      return [];
    }
@@ -160,6 +182,56 @@ async function fitToAirports(page: Page, icaos: string[]): Promise<void> {
  await page.waitForTimeout(300);
 }

+// [lon, lat] of an airport from the same /api/airports dataset the map draws its traces from.
+async function airportLonLat(page: Page, icao: string): Promise<[number, number]> {
+  const fc = (await (await page.request.get('/api/airports')).json()) as {
+    features: Array<{ properties: { icao: string; lat: number; lon: number } }>;
+  };
+  const f = fc.features.find((x) => x.properties.icao === icao);
+  if (!f) throw new Error(`airport ${icao} not found in /api/airports`);
+  return [f.properties.lon, f.properties.lat];
+}
+
+// ISS-022/025/027: the hover-route layer must hold the great-circle trace from origin to dest.
+// MapLibre stores GeoJSON geometry in per-tile INTEGER grids and clips long lines across tiles, so
+// queryRenderedFeatures returns ONE FEATURE PER TILE the line crosses (the 1420 km EDDF→LEMD leg is
+// 4 segments at z=4 / 5 at z=5) with coordinates quantized to the rendered zoom's grid — up to ~half
+// a grid step off (~0.001° observed at z≥4, ~0.02° worst case at z=0). A strict single-feature +
+// exact-coords comparison can therefore never match even when the line is drawn correctly (CI run #69:
+// all three hover-route timeouts while the trace was visibly rendered), so we accept any number of
+// segments and require some segment to START within EPS of `from` and some to END within EPS of `to`.
+// The true endpoints survive clipping verbatim in whichever tile contains them. (CI runs #69–#71:
+// features could arrive WITHOUT a usable geometry because Playwright's evaluate serialization drops
+// the lazy prototype getter — not MapLibre artifacts; renderedFeatures now maps to plain objects
+// in-page.) The helper still filters to real LineString segments and treats "none yet" as keep-polling
+// instead of throwing inside the poll callback. Call fitToAirports([from, to]) first — rendered
+// features are viewport-scoped.
+const HOVER_ROUTE_EPS_DEG = 0.05; // ~5 km: above worst-case quantization at any zoom, below the distance between any two EU airports
+
+async function expectHoverRoute(page: Page, fromIcao: string, toIcao: string): Promise<void> {
+  const [from, to] = await Promise.all([airportLonLat(page, fromIcao), airportLonLat(page, toIcao)]);
+  const near = (a: [number, number], b: [number, number]) =>
+    Math.abs(a[0] - b[0]) <= HOVER_ROUTE_EPS_DEG && Math.abs(a[1] - b[1]) <= HOVER_ROUTE_EPS_DEG;
+  await expect.poll(async () => {
+    const feats = (await renderedFeatures(page, ['hover-route'])) as Array<{ geometry?: { type: string; coordinates: [number, number][] } }>;
+    // Features are plain objects with in-page-evaluated geometry (see renderedFeatures). The filter
+    // guards against degenerate/zero-length clipped segments and keeps this poll callback total — a
+    // throw inside expect.poll fails the test instantly instead of retrying. "None yet" → keep polling.
+    const segs = feats.filter(
+      (f): f is { geometry: { type: 'LineString'; coordinates: [number, number][] } } =>
+        !!f.geometry && f.geometry.type === 'LineString' && Array.isArray(f.geometry.coordinates) && f.geometry.coordinates.length >= 2,
+    );
+    if (!segs.length) return false;
+    // The line may be clipped into several per-tile segments — check the endpoints across all of them.
+    const startsAtFrom = segs.some((f) => near(f.geometry.coordinates[0], from));
+    const endsAtTo = segs.some((f) => {
+      const c = f.geometry.coordinates;
+      return near(c[c.length - 1], to);
+    });
+    return startsAtFrom && endsAtTo;
+  }, { timeout: 15_000, message: `waiting for the hover-route line ${fromIcao} → ${toIcao}` }).toBe(true);
+}
+
 test('hovering a fleet row highlights the plane on the map', async ({ page }) => {
  test.setTimeout(300_000); // self-heal can take minutes after an interrupted run
  await flyHomeViaApi(page); // deterministic: the starter sits at EDDF, inside the initial view
@@ -230,6 +302,7 @@ test('hovering an open package highlights its endpoint airports', async ({ page
  await fitToAirports(page, [HUB, DEST]);

  expect(await renderedFeatures(page, ['airports-highlight'])).toHaveLength(0);
+  expect(await renderedFeatures(page, ['airports-target-highlight'])).toHaveLength(0);

  await row.hover();
  await expect.poll(async () => {
@@ -238,11 +311,129 @@ test('hovering an open package highlights its endpoint airports', async ({ page
  }, { timeout: 15_000, message: 'waiting for the airports-highlight layer to show both endpoints' })
    .toBe(JSON.stringify([HUB, DEST].sort()));

+  // ISS-022 (v0.22.0): the ENTIRE trace is drawn too — a great-circle line from origin to dest,
+  // not just the endpoint rings.
+  await expectHoverRoute(page, HUB, DEST);
+
+  // And the TARGET airport gets its own distinct-colored ring — only the destination, never the origin.
+  await expect.poll(async () => {
+    const feats = (await renderedFeatures(page, ['airports-target-highlight'])) as Array<{ properties: Record<string, unknown> }>;
+    return JSON.stringify(feats.map((f) => f.properties.icao).sort());
+  }, { timeout: 15_000, message: 'waiting for the airports-target-highlight layer to ring only the destination' })
+    .toBe(JSON.stringify([DEST]));
+
  await unhover(page);
  await expect.poll(async () => (await renderedFeatures(page, ['airports-highlight'])).length, {
    timeout: 15_000,
    message: 'waiting for the highlight to clear after mouseleave',
  }).toBe(0);
+  await expect.poll(async () => (await renderedFeatures(page, ['hover-route'])).length, {
+    timeout: 15_000,
+    message: 'waiting for the hover route trace to clear after mouseleave',
+  }).toBe(0);
+  await expect.poll(async () => (await renderedFeatures(page, ['airports-target-highlight'])).length, {
+    timeout: 15_000,
+    message: 'waiting for the target ring to clear after mouseleave',
+  }).toBe(0);
+});
+
+test('hovering an on-board cargo row draws its trace and keeps the plane halo', async ({ page }) => {
+  test.setTimeout(300_000); // self-heal can take minutes after an interrupted run
+  await flyHomeViaApi(page); // deterministic: the starter sits grounded at EDDF
+
+  // Load a package onto the grounded starter so it shows up in the On board section.
+  const pkg = await createPackage(page, HUB, DEST);
+  const load = await page.request.post(`/api/packages/${pkg.id}/load`, { data: { planeId: 'plane-starter' } });
+  expect(load.status()).toBe(200);
+
+  await page.goto('/');
+  await waitForAirportCount(page);
+
+  const row = page.locator(`[data-testid="onboard-package-${pkg.id}"]`);
+  await expect(row, 'the loaded package appears in the On board section').toBeVisible({ timeout: 15_000 });
+
+  // Both endpoints must be in-viewport for queryRenderedFeatures to see the trace.
+  await fitToAirports(page, [HUB, DEST]);
+
+  await row.hover();
+  // ISS-025 (v0.22.0): same full origin→dest trace as job-list rows…
+  await expectHoverRoute(page, HUB, DEST);
+  // …and the package's plane keeps its halo lit (the hover carries planeId).
+  await expect.poll(async () => {
+    const feats = (await renderedFeatures(page, ['planes-highlight'])) as Array<{ properties: Record<string, unknown> }>;
+    return feats.length > 0 && feats[0].properties.id === 'plane-starter';
+  }, { timeout: 15_000, message: 'waiting for the planes-highlight layer to show plane-starter' }).toBe(true);
+
+  await unhover(page);
+  await expect.poll(async () => (await renderedFeatures(page, ['hover-route'])).length, {
+    timeout: 15_000,
+    message: 'waiting for the hover route trace to clear after mouseleave',
+  }).toBe(0);
+  await expect.poll(async () => (await renderedFeatures(page, ['planes-highlight'])).length, {
+    timeout: 15_000,
+    message: 'waiting for the highlight to clear after mouseleave',
+  }).toBe(0);
+
+  // Leave the instance clean: abandon the loaded package so later specs start with an empty starter.
+  const res = await page.request.post(`/api/packages/${pkg.id}/abandon`);
+  expect(res.status()).toBe(200);
+});
+
+test('hovering the Relocate section previews the planned route and target airport', async ({ page }) => {
+  test.setTimeout(300_000); // self-heal can take minutes after an interrupted run
+  await flyHomeViaApi(page); // deterministic: the starter sits grounded at EDDF
+
+  await page.goto('/');
+  await waitForAirportCount(page);
+
+  const section = page.getByTestId('relocate-section');
+  await expect(section, 'the Relocate section is visible').toBeVisible({ timeout: 15_000 });
+
+  // LeftPane fetches /api/airports on its own (separate from the map header count) — wait for
+  // the destination options to populate before selecting.
+  await expect(page.getByTestId('relocate-dest').locator(`option[value="${DEST}"]`)).toHaveCount(1, { timeout: 15_000 });
+
+  // Pick the starter + a known destination explicitly (the effective-selection defaults already do this).
+  await page.getByTestId('relocate-plane').selectOption('plane-starter');
+  await page.getByTestId('relocate-dest').selectOption(DEST);
+
+  // Both endpoints must be in-viewport for queryRenderedFeatures to see the trace.
+  await fitToAirports(page, [HUB, DEST]);
+
+  expect(await renderedFeatures(page, ['hover-route'])).toHaveLength(0);
+  expect(await renderedFeatures(page, ['airports-highlight'])).toHaveLength(0);
+  expect(await renderedFeatures(page, ['airports-target-highlight'])).toHaveLength(0);
+
+  // ISS-027 (v0.22.0): hovering the panel with a plane + destination selected previews the flight —
+  // dashed trace from the plane's airport to the destination…
+  await section.hover();
+  await expectHoverRoute(page, HUB, DEST);
+  // …and rings ONLY the target airport (the origin stays unmarked).
+  await expect.poll(async () => {
+    const feats = (await renderedFeatures(page, ['airports-highlight'])) as Array<{ properties: Record<string, unknown> }>;
+    return JSON.stringify(feats.map((f) => f.properties.icao).sort());
+  }, { timeout: 15_000, message: 'waiting for the airports-highlight layer to ring only the target' })
+    .toBe(JSON.stringify([DEST]));
+  // …plus the destination's own distinct-colored ring (ISS-022) — same single icao.
+  await expect.poll(async () => {
+    const feats = (await renderedFeatures(page, ['airports-target-highlight'])) as Array<{ properties: Record<string, unknown> }>;
+    return JSON.stringify(feats.map((f) => f.properties.icao).sort());
+  }, { timeout: 15_000, message: 'waiting for the airports-target-highlight layer to ring only the target' })
+    .toBe(JSON.stringify([DEST]));
+
+  await unhover(page);
+  await expect.poll(async () => (await renderedFeatures(page, ['hover-route'])).length, {
+    timeout: 15_000,
+    message: 'waiting for the hover route trace to clear after mouseleave',
+  }).toBe(0);
+  await expect.poll(async () => (await renderedFeatures(page, ['airports-highlight'])).length, {
+    timeout: 15_000,
+    message: 'waiting for the highlight to clear after mouseleave',
+  }).toBe(0);
+  await expect.poll(async () => (await renderedFeatures(page, ['airports-target-highlight'])).length, {
+    timeout: 15_000,
+    message: 'waiting for the target ring to clear after mouseleave',
+  }).toBe(0);
 });

 test('hovering an on-board block of a flying plane highlights its route', async ({ page }) => {
@@ -69,6 +69,12 @@ test('left pane renders wallet, reputation and the starter fleet at Frankfurt',

  // Sim clock renders (UTC wall-clock of the game time).
  await expect(page.getByTestId('sim-clock')).toContainText(/UTC/);
+
+  // ISS-021 (v0.20.0): the On board section moved to the left pane (between Fleet and Time) —
+  // its heading renders here…
+  await expect(page.getByTestId('left-pane').getByRole('heading', { name: 'On board', exact: true })).toBeVisible();
+  // …and no longer in the right pane.
+  await expect(page.getByTestId('right-pane').getByRole('heading', { name: 'On board', exact: true })).toHaveCount(0);
 });

 test('time controls: pause freezes the sim and the ladder slider sets timeScale', async ({ page }) => {
@@ -3,7 +3,7 @@ import { expect, test } from '@playwright/test';

 // v0.18.0 — ISS-010: relocating a GROUNDED (empty) plane to any airport against the live origin.
 // Two UI surfaces drive the EXISTING POST /api/planes/{id}/fly endpoint (pure repositioning has
-// been allowed since v0.12.0 — no API change): the right-pane market row
+// been allowed since v0.12.0 — no API change): the left-pane Relocate section (ISS-023, v0.21.0)
 // (relocate-plane / relocate-dest / relocate-go) and the Relocate row inside the airport popup on
 // the map (airport-popup-plane / airport-popup-relocate). Marker-size regression is covered by
 // the existing e2e/map.spec.ts click tests, not here.
@@ -90,7 +90,7 @@ test.afterEach(async ({ page }) => {

 test.describe.configure({ mode: 'serial' }); // shared live DB — order matters within this file

-test('market row relocates a grounded plane via the right pane', async ({ page }) => {
+test('left pane Relocate section relocates a grounded plane', async ({ page }) => {
  test.setTimeout(300_000); // self-heal (worst case ~20 s at 1000×) + one short leg
  await flyHomeViaApi(page);

@@ -2,8 +2,9 @@ import type { Page } from '@playwright/test';
 import { expect, test } from '@playwright/test';

 // v0.12.0 — right Jobs & Market pane against the live origin: open packages render with
-// names/reward/deadline and Load (UI click) binds one to the starter; the on-board list shows
-// loaded packages with fly-to-destination + abandon buttons (penalty preview from the same
+// names/reward/deadline and Load (UI click) binds one to the starter; the on-board list
+// (moved to the left pane in v0.20.0, ISS-021) shows loaded packages with fly-to-destination +
+// abandon buttons (penalty preview from the same
 // formula as the server); flying planes show their current leg; market buy/sell/refuel previews
 // match the catalog + economy constants exposed in /api/state. Packages are created via
 // POST /api/test/create-package (FLIGHT_TEST_HOOKS=1), same pattern as e2e/actions.spec.ts.
@@ -1,6 +1,6 @@
 import { describe, expect, it } from 'vitest';
 import type { StateSnapshot } from './game/state';
-import { planesGeoJson, routesGeoJson, greatCircleArc, ROUTE_ARC_SEGMENTS, type AirportCoord } from './mapData';
+import { planesGeoJson, routesGeoJson, hoverRouteGeoJson, greatCircleArc, ROUTE_ARC_SEGMENTS, type AirportCoord } from './mapData';
 import { haversineKm } from './geo';

 const AIRPORTS = new Map<string, AirportCoord>([
@@ -140,6 +140,42 @@ describe('routesGeoJson (v0.12.0 — one line per flying plane\'s current leg)',
  });
 });

+describe('hoverRouteGeoJson (ISS-022/025/027 v0.22.0 — hover route trace)', () => {
+  it('returns an empty collection for the no-hover "" sentinel', () => {
+    expect(hoverRouteGeoJson('', '', AIRPORTS)).toEqual({ type: 'FeatureCollection', features: [] });
+  });
+
+  it('draws one great-circle line between two known airports with exact endpoints', () => {
+    const fc = hoverRouteGeoJson('EDDF', 'EHAM', AIRPORTS);
+    expect(fc.features).toHaveLength(1);
+    expect(fc.features[0].properties).toEqual({ planeId: '' }); // pure overlay — no owning plane
+    const coords = fc.features[0].geometry.coordinates;
+    expect(coords.length).toBe(ROUTE_ARC_SEGMENTS + 1); // sampled arc, not a 2-point chord
+    expect(coords[0]).toEqual([8.56, 50.03]); // EDDF [lon, lat] — exact endpoint
+    expect(coords[coords.length - 1]).toEqual([4.76, 52.31]); // EHAM — exact endpoint
+  });
+
+  it('draws the same trace reversed (endpoints swapped, arc mirrored)', () => {
+    const ab = hoverRouteGeoJson('EDDF', 'EHAM', AIRPORTS).features[0].geometry.coordinates;
+    const ba = hoverRouteGeoJson('EHAM', 'EDDF', AIRPORTS).features[0].geometry.coordinates;
+    expect(ba.length).toBe(ab.length);
+    // The slerp is symmetric up to floating-point rounding (1 − t ≠ (N−t)/N bit-exactly), so
+    // compare with a tolerance: each reversed point sits on the forward arc within ~1e-9 degrees.
+    for (let i = 0; i < ab.length; i++) {
+      expect(Math.abs(ba[i][0] - ab[ab.length - 1 - i][0])).toBeLessThan(1e-9);
+      expect(Math.abs(ba[i][1] - ab[ab.length - 1 - i][1])).toBeLessThan(1e-9);
+    }
+  });
+
+  it('returns an empty collection when the from airport is missing from the dataset', () => {
+    expect(hoverRouteGeoJson('ZZZZ', 'EDDV', AIRPORTS)).toEqual({ type: 'FeatureCollection', features: [] });
+  });
+
+  it('returns an empty collection when the to airport is missing from the dataset', () => {
+    expect(hoverRouteGeoJson('EDDF', 'ZZZZ', AIRPORTS)).toEqual({ type: 'FeatureCollection', features: [] });
+  });
+});
+
 describe('greatCircleArc (v0.12.2 — curved route traces)', () => {
  it('samples >2 points with the endpoints exactly at the airport coords', () => {
    const arc = greatCircleArc(AIRPORTS.get('EDDF')!, AIRPORTS.get('EHAM')!);
@@ -85,6 +85,33 @@ export function greatCircleArc(from: AirportCoord, to: AirportCoord): [number, n
  return coords;
 }

+// ISS-022/025/027 (v0.22.0): the hover route trace — one great-circle LineString between two
+// airports, drawn top-most while a panel row hovers (job-list rows, on-board cargo rows, the
+// Relocate section). Empty collection when either endpoint is missing from the dataset — never
+// guessed; the '' sentinel (no hovered target) resolves to nothing and yields the same.
+export function hoverRouteGeoJson(
+  fromIcao: string,
+  toIcao: string,
+  airportsByIcao: ReadonlyMap<string, AirportCoord>,
+): FeatureCollection<MapLineFeature> {
+  const from = airportsByIcao.get(fromIcao);
+  const to = airportsByIcao.get(toIcao);
+  if (!from || !to) return EMPTY_LINES;
+  return {
+    type: 'FeatureCollection',
+    features: [
+      {
+        type: 'Feature',
+        geometry: {
+          type: 'LineString',
+          coordinates: greatCircleArc(from, to),
+        },
+        properties: { planeId: '' }, // no owning plane — a pure hover overlay
+      },
+    ],
+  };
+}
+
 // One LineString per FLYING plane — its current leg from locationIcao to dest_icao.
 // Grounded planes draw nothing; a flying plane missing either endpoint from the
 // dataset is skipped, never guessed. The line is sampled along the great circle
@@ -0,0 +1,53 @@
+'use client';
+
+import { useCallback, useEffect, useState } from 'react';
+import type { StateSnapshot } from '@/lib/game/state';
+
+// ISS-021 (v0.20.0) — shared action runner for the side panes (extracted verbatim from
+// RightPane.runAction when the On board section moved to LeftPane). POSTs an action endpoint;
+// every success returns the FULL post-action snapshot (v0.8.0 convention), pushed into the
+// shared shell state immediately via applySnapshot so the UI updates without waiting for the
+// next poll tick. A non-2xx {error} body becomes the pane's inline error AND is mirrored to
+// the shell as a bottom-right toast via onError (ISS-008 — both surfaces by design). Buttons
+// are disabled while a request is in flight, so at most one action runs per pane at a time.
+export function useGameAction(
+  state: StateSnapshot | null,
+  applySnapshot: (snapshot: StateSnapshot) => void,
+  onError?: (message: string) => void,
+): { runAction: (path: string, body?: unknown) => Promise<void>; busy: boolean; actionError: string | null } {
+  const [busy, setBusy] = useState(false);
+  // Inline error from a failed action — auto-clears on the next successful poll (the shell's
+  // snapshot prop changes every tick) or the next successful action.
+  const [actionError, setActionError] = useState<string | null>(null);
+  useEffect(() => {
+    if (state !== null) setActionError(null);
+  }, [state]);
+
+  const runAction = useCallback(
+    async (path: string, body?: unknown) => {
+      if (busy) return;
+      setBusy(true);
+      try {
+        const res = await fetch(path, {
+          method: 'POST',
+          headers: { 'Content-Type': 'application/json' },
+          body: body === undefined ? undefined : JSON.stringify(body),
+          cache: 'no-store',
+        });
+        const data = (await res.json()) as StateSnapshot & { error?: string };
+        if (!res.ok) throw new Error(data.error ?? `HTTP ${res.status}`);
+        setActionError(null);
+        applySnapshot(data);
+      } catch (err) {
+        const message = err instanceof Error ? err.message : String(err);
+        setActionError(message); // inline pane error stays…
+        onError?.(message); // …and the shell mirrors it as a bottom-right toast (ISS-008)
+      } finally {
+        setBusy(false);
+      }
+    },
+    [applySnapshot, busy, onError],
+  );
+
+  return { runAction, busy, actionError };
+}
@@ -1,6 +1,6 @@
 {
  "name": "flight-ops",
-  "version": "0.19.0",
+  "version": "0.22.0",
  "private": true,
  "scripts": {
    "dev": "next dev -p 3000",
Author	SHA1	Message	Date
kamilkrzywda	5391636979	Merge pull request 'v0.22.0 — ISS-022/025/027 hover route trace (job list, on-board rows, relocation panel)' (#34 ) from feat/hover-trace into master CI / build + unit + e2e (push) Failing after 7m10s Details	2026-09-20 03:58:03 +02:00
kamilkrzywda	ab79d9b17f	fix(e2e): renderedFeatures — evaluate maplibre geometry getter in-page before Playwright serialization drops it CI / build + unit + e2e (pull_request) Successful in 7m28s Details	2026-09-20 01:50:23 +00:00
kamilkrzywda	505a58b4fe	fix(e2e): expectHoverRoute — ignore queryRenderedFeatures artifacts without LineString geometry (CI run #70 ) CI / build + unit + e2e (pull_request) Failing after 7m49s Details	2026-09-20 01:22:23 +00:00
kamilkrzywda	2655ef81c8	fix: hover-route line not drawn in e2e — MapLibre clips queried lines across tiles and quantizes their coordinates (strict single-feature equality never matched) CI / build + unit + e2e (pull_request) Failing after 6m44s Details	2026-09-19 22:52:12 +00:00
kamilkrzywda	ac4e3fa316	feat: v0.22.0 — ISS-022 target airport distinct-color ring on job-list / relocation hover CI / build + unit + e2e (pull_request) Failing after 8m51s Details	2026-09-19 22:01:02 +00:00
kamilkrzywda	f2dbad5e03	feat: v0.22.0 — ISS-022/025/027 hover route trace on job list, on-board rows and relocation panel	2026-09-19 21:47:00 +00:00
kamilkrzywda	096a6bfe61	Merge pull request 'v0.21.0 — ISS-023 Relocate (empty flight) panel moves to left pane' (#33 ) from feat/relocate-left-pane into master CI / build + unit + e2e (push) Successful in 5m52s Details	2026-09-19 23:14:42 +02:00
kamilkrzywda	71ee63b38a	feat: v0.21.0 — ISS-023 Relocate panel moves to left pane CI / build + unit + e2e (pull_request) Successful in 5m54s Details	2026-09-19 21:02:55 +00:00
kamilkrzywda	a4f7947666	Merge pull request 'feat: v0.20.0 — ISS-021 move On board to left pane, widen left 360/280' (#31 ) from feat/onboard-left-pane into master CI / build + unit + e2e (push) Successful in 6m8s Details	2026-09-19 22:52:02 +02:00
kamilkrzywda	570ad52d47	feat: v0.20.0 part 2 — ISS-028 on-board rows two-line layout + airport name ellipsis CI / build + unit + e2e (pull_request) Successful in 7m1s Details	2026-09-19 20:41:33 +00:00
kamilkrzywda	59974d1b79	feat: v0.20.0 — ISS-021 move On board to left pane, widen left 360/280	2026-09-19 20:41:33 +00:00
kamilkrzywda	af5176354a	Merge pull request 'v0.19.2 — AGENTS.md: CI-only e2e workflow + connected-issues exception' (#32 ) from docs/agents-md-e2e-ci-only into master CI / build + unit + e2e (push) Successful in 6m23s Details	2026-09-19 22:34:34 +02:00
kamilkrzywda	f5468bb640	docs: v0.19.2 — AGENTS.md e2e section reflects CI-only runs; connected issues may be done together CI / build + unit + e2e (pull_request) Successful in 7m5s Details	2026-09-19 20:06:40 +00:00
kamilkrzywda	0970ee4710	docs: v0.19.1 — AGENTS.md documents enforced CI gate + auto-merge CI / build + unit + e2e (pull_request) Successful in 7m32s Details CI / build + unit + e2e (push) Successful in 6m43s Details	2026-09-19 18:49:52 +00:00