Merge pull request 'v0.19.0 — ISS-011 auto-slow to 1× when all planes have landed' (#24) from feat/auto-slow-on-idle into master

CHANGELOG.md

@@ -1,5 +1,24 @@
 # Changelog
 
+## 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
+- **No auto-restore by design.** The previous scale is not remembered — once the game slows to 1× after the last landing, the player speeds up manually again (slider or `POST /api/sim`). Deliberately minimal scope: no "resume my old speed" behavior
+- Tests: unit — new `describe('auto-slow …')` block in `lib/sim/engine.test.ts`: last plane lands → stored timeScale becomes 1; a landing while another plane is still flying → no change; already at 1× → stays 1; paused sim with all planes landed → no change. e2e — new `e2e/auto-slow.spec.ts` (serial mode, SCALE=1000, self-heal fly-home in afterEach like relocation.spec.ts): sets 1000× via the API, dispatches plane-starter on the shortest leg from its hub (EDDF → nearest airport), waits for the landing and asserts the server's `timeScale` is exactly 1 in that snapshot, then proves manual override still works (`POST /api/sim {timeScale: 1000}` confirmed by response + fresh snapshot)
+- **e2e suite adapted to the new behavior.** Every existing spec that flies out-and-back relied on 1000× persisting across a landing — with ISS-011 it no longer does, so each return leg now re-sets SCALE explicitly: `flyHomeViaApi` in actions/relocation/right-pane/hover (re-set before the repositioning flight after waiting for an in-flight leg to land) and the restore legs inside the test bodies of actions.spec.ts (core loop, expired packages, validation paths ×2), right-pane.spec.ts (fly-to-destination, refuel-for-leg) and hover.spec.ts (flying-plane route highlight). map-interactions.spec.ts needed no change — its `loadAndFly` helper already re-sets SCALE before every landing wait
+- Verified: `tsc --noEmit` clean; unit suite green locally; e2e not run locally by design — CI verifies against an isolated stack
+
+## v0.18.0 — 2026-09-19 16:02
+- **Relocate a grounded (empty) plane to any airport (ISS-010).** `flyPlane` has allowed pure repositioning since v0.12.0, but the UI only exposed flying for planes that carried cargo — an empty grounded plane had no fly control anywhere. Two new surfaces now drive the EXISTING `POST /api/planes/{id}/fly {destIcao}` endpoint (no API or OpenAPI change):
+  - **Right-pane market row** (`components/RightPane.tsx`): a fourth `.market-row` with `[data-testid="relocate-plane"]` (grounded planes, "ATR 72-600 — EDDF" labels), `[data-testid="relocate-dest"]` (all airports from a one-time `GET /api/airports` fetch per page life — same promise-ref pattern as Map.tsx — sorted by name for stable e2e selection) and the `[data-testid="relocate-go"]` "Relocate" button, disabled while busy or until both selects have a value. Same effective-selection + `runAction` pattern as the buy/sell/refuel rows (first grounded plane / first airport preselected); the row wraps (`market-row-relocate`) since two selects don't fit one 360 px line
+  - **Airport popup Relocate row** (`components/Map.tsx`): after the name/ICAO/local-time/weather lines, a `.popup-relocate` block with `[data-testid="airport-popup-plane"]` (grounded planes from the latest polled snapshot at click time) and `[data-testid="airport-popup-relocate"]` "Relocate here" — disabled until a plane is picked; on click it POSTs fly to the clicked airport, pushes the response snapshot through the shell's `applySnapshot` (new Map prop, same callback RightPane receives), and reports success/failure in `[data-testid="airport-popup-relocate-status"]`. With no grounded planes the row shows `[data-testid="airport-popup-no-planes"]` instead. Popups are plain HTML, not React — controls wired via `popup.getElement().querySelector(...)` after `.addTo(map)`
+- **Bigger airport markers (ISS-010).** The r=3 dots were hard to click: `airports-circles` paint in `components/Map.tsx` goes from radius 3 / stroke 1 to radius 5 / stroke 1.5, and the hover highlight ring follows (r=8 → r=9). Paint-only — no data or interaction changes
+- No server or OpenAPI changes — both surfaces reuse the existing fly endpoint (validations unchanged: 404 unknown plane / 409 flying or insufficient fuel / 400 unknown ICAO, strict unknown-field rejection kept)
+- Tests: e2e — new `e2e/relocation.spec.ts` (serial mode, SCALE=1000, self-heal fly-home in afterEach like actions.spec.ts): market-row test ensures plane-starter grounded at the hub via API, picks it + the nearest non-hub airport (shortest leg) and asserts `/api/state` shows `flying` with that destIcao after clicking Relocate; popup test clicks the isolated LFRS marker (projected-center pattern from map.spec.ts), asserts the select lists "ATR 72-600 — EDDF" and the button is disabled until a plane is picked, then relocates via the popup. Marker-size regression gate = the existing map.spec.ts click tests keep passing
+- Verified: `tsc --noEmit` clean; unit suite green locally (no lib/ changes — flyPlane's zero-package case already covered by actions.test.ts); e2e not run locally by design — CI verifies against an isolated stack
+- **Fix (CI run #50): POPUP_AIRPORT scoping in the popup relocation e2e.** The LFRS marker click passed `POPUP_AIRPORT` into a `page.evaluate(() => …)` callback that runs in the BROWSER, where Node-scope constants don't exist — deterministic `ReferenceError: POPUP_AIRPORT is not defined` (relocation.spec.ts popup test, both attempts of run #50). The constant is now passed as an evaluate argument (`page.evaluate(({lon, lat}) => …, POPUP_AIRPORT)`); the other evaluate in the file only touches browser globals and needed no change. Test-only — no app code touched
+- **Fix (CI run #51): strict-mode locator in the popup relocation e2e.** `expect(planeSel.locator('option')).toContainText(…)` resolved to BOTH options (placeholder + plane) → strict mode violation (relocation.spec.ts popup test, both attempts of run #51; the app rendered correctly). The assertion now targets `option[value="plane-starter"]` specifically with `toHaveText`. Test-only — no app code touched
+
 ## v0.17.0 — 2026-09-19 14:49
 - **Bottom-right toasts for action errors (ISS-008).** Error messages like "insufficient funds: a ATR 72-600 costs 200000, you have 62721" now appear as toasts in the bottom-right corner — new `lib/useToasts.ts` hook (`useToasts() → {toasts, push(kind, msg), dismiss(id)}`, auto-dismiss after ~5 s, queue capped at 4 dropping the oldest; pure core `pushToast` unit-tested) and new `components/Toasts.tsx` `<ToastStack>` (fixed container `.toasts`, items `[data-testid="toast"]` with class `toast toast-error|toast-info` + a × dismiss button). Wired into BOTH error paths: `RightPane.runAction`'s catch now calls the shell's `onError` in addition to keeping the inline `[data-testid="right-error"]` pane error, and `LeftPane.applySimControls`'s catch (previously console.error-only) reports "Failed to update time controls (…)" through the same callback. The shell (`app/page.tsx`) owns the hook and renders the stack; CSS in `app/globals.css`
 - **Event messages via snapshot diffing.** No server event feed exists, so new pure `lib/deriveEvents.ts` — `diffSnapshots(prev: StateSnapshot | null, next) → {kind:'info', message}[]` — derives human-readable events from the fields already in `/api/state`: plane landing (`flying→available`, "ATR 72-600 landed at Frankfurt"), package delivery (`loaded→delivered`, "Package delivered: +€X" with the reward), expiry (`open|loaded→expired`, "Package expired: A → B"), new packages (id only in next, "New package available: A → B") and planes bought/sold (plane id set changed, "Bought/Sold {model}"). The shell keeps a `prevRef` and diffs on every snapshot change, pushing each event as an info toast; the first snapshot after load emits nothing (no baseline — no page-load spam)

app/globals.css

@@ -68,6 +68,40 @@ body {
   color: #cbd5e1;
 }
 
+/* ISS-010 (v0.18.0) — Relocate row inside the airport popup (plain HTML, not React). */
+.popup-relocate {
+  margin-top: 8px;
+  display: flex;
+  align-items: center;
+  gap: 6px;
+  flex-wrap: wrap;
+}
+
+.popup-relocate select {
+  font-size: 12px;
+  padding: 3px 6px;
+  border-radius: 4px;
+  border: 1px solid rgba(148, 163, 184, 0.4);
+}
+
+.popup-relocate button {
+  font-size: 12px;
+  padding: 3px 10px;
+  border-radius: 4px;
+  border: 1px solid rgba(148, 163, 184, 0.4);
+  cursor: pointer;
+}
+
+.popup-relocate button:disabled {
+  opacity: 0.5;
+  cursor: default;
+}
+
+[data-testid='airport-popup-relocate-status'] {
+  font-size: 11px;
+  color: #334155;
+}
+
 /* v0.9.0 — single-screen 3-pane shell: left Assets / center map / right Jobs & Market */
 .app-shell {
   display: grid;
@@ -327,6 +361,12 @@ body {
   padding: 4px 0;
 }
 
+/* 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. */
+.market-row-relocate {
+  flex-wrap: wrap;
+}
+
 .market-preview {
   font-size: 12px;
   color: #f8fafc;

app/page.tsx

@@ -44,8 +44,10 @@ export default function Home() {
   return (
     <div className="app-shell">
       <LeftPane state={state} loading={loading} error={error} onRefresh={refresh} onHover={setHovered} onError={onError} />
-      {/* v0.11.0 — the same polled snapshot drives the map's plane markers + route lines */}
-      <Map state={state} hovered={hovered} />
+      {/* 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 */}
+      <Map state={state} hovered={hovered} applySnapshot={applySnapshot} />
       <RightPane state={state} loading={loading} applySnapshot={applySnapshot} onHover={setHovered} onError={onError} />
       <ToastStack toasts={toasts} onDismiss={dismiss} />
     </div>

components/Map.tsx

@@ -45,11 +45,14 @@ interface MapProps {
   // 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.
   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.
+  applySnapshot: (snapshot: StateSnapshot) => void;
 }
 
 // Named FlightMap (not Map): a component called `Map` would shadow the global
 // Map constructor inside its own body, breaking `new Map(...)` for the airport index.
-export default function FlightMap({ state, hovered }: MapProps) {
+export default function FlightMap({ state, hovered, applySnapshot }: MapProps) {
   const containerRef = useRef<HTMLDivElement>(null);
   const mapRef = useRef<maplibregl.Map | null>(null);
   // /api/airports is fetched at most once per page life: every styledata event
@@ -58,6 +61,12 @@ export default function FlightMap({ state, hovered }: MapProps) {
   // Latest snapshot + airport coordinate index, so the mount effect's styledata wiring
   // and the state-change effect can both push data without prop-drilling into closures.
   const stateRef = useRef<StateSnapshot | null>(null);
+  // ISS-010 (v0.18.0): the shell's applySnapshot is stable (useCallback with no deps), but the
+  // mount effect captures it once — keep a ref so the popup wiring always calls the latest one.
+  const applySnapshotRef = useRef(applySnapshot);
+  useEffect(() => {
+    applySnapshotRef.current = applySnapshot;
+  }, [applySnapshot]);
   const airportsIndexRef = useRef<Map<string, AirportCoord> | null>(null);
   const [airportCount, setAirportCount] = useState<number | null>(null);
   const [styleId, setStyleId] = useState<string>(DEFAULT_STYLE_ID);
@@ -156,16 +165,67 @@ export default function FlightMap({ state, hovered }: MapProps) {
         // deterministic generated weather — no gameplay effects per PLAN.md.
         const w = weatherFor(p.icao);
         const localTime = approxLocalTime(p.lon, Date.now());
-        new maplibregl.Popup({ offset: 10 })
+        // ISS-010 (v0.18.0): Relocate row — grounded planes from the latest snapshot can be
+        // repositioned to this airport via POST /api/planes/{id}/fly (pure repositioning).
+        const st = stateRef.current;
+        const groundedPlanes = st ? st.planes.filter((pl) => pl.status === 'available') : [];
+        const planeLabel = (model: string) => st?.catalog.find((c) => c.model === model)?.label ?? model;
+        const relocateHtml =
+          groundedPlanes.length > 0
+            ? `<select data-testid="airport-popup-plane" aria-label="Plane to relocate here">` +
+              `<option value="">Select a plane\u2026</option>` +
+              groundedPlanes.map(
+                (pl) =>
+                  `<option value="${escapeHtml(pl.id)}">${escapeHtml(planeLabel(pl.model))} \u2014 ${escapeHtml(pl.locationIcao)}</option>`,
+              ).join('') +
+              `</select><button type="button" data-testid="airport-popup-relocate" disabled>Relocate here</button>`
+            : `<span data-testid="airport-popup-no-planes">No grounded planes to relocate.</span>`;
+        const popup = new maplibregl.Popup({ offset: 10 })
           .setLngLat(f.geometry.coordinates as [number, number])
           .setHTML(
             `<div data-testid="airport-popup">` +
               `<strong>${escapeHtml(p.name)}</strong><br/>${escapeHtml(p.icao)}<br/>` +
               `<span data-testid="airport-local-time">${localTime} local (approx)</span><br/>` +
               `<span data-testid="airport-weather">${w.condition}, wind ${w.windDirDeg}\u00B0 / ${w.windKt} kt, vis ${w.visibilityM} m</span>` +
+              `<div class="popup-relocate">` + relocateHtml + `<span data-testid="airport-popup-relocate-status"></span></div>` +
             `</div>`,
           )
           .addTo(map);
+
+        // Popups are plain HTML, not React — the element only exists after addTo, so wire the
+        // controls via querySelector (the select enables the button once a plane is picked).
+        const el = popup.getElement();
+        const select = el?.querySelector<HTMLSelectElement>('[data-testid="airport-popup-plane"]');
+        const button = el?.querySelector<HTMLButtonElement>('[data-testid="airport-popup-relocate"]');
+        // The status span is always in the popup HTML (even with no grounded planes), so it
+        // exists whenever the select/button do.
+        const statusEl = el?.querySelector<HTMLElement>('[data-testid="airport-popup-relocate-status"]');
+        if (select && button && statusEl) {
+          select.addEventListener('change', () => {
+            button.disabled = select.value === '';
+          });
+          button.addEventListener('click', async () => {
+            const planeId = select.value;
+            if (!planeId || button.disabled) return;
+            button.disabled = true;
+            statusEl.textContent = 'Relocating\u2026';
+            try {
+              const res = await fetch(`/api/planes/${planeId}/fly`, {
+                method: 'POST',
+                headers: { 'Content-Type': 'application/json' },
+                body: JSON.stringify({ destIcao: p.icao }),
+                cache: 'no-store',
+              });
+              const data = (await res.json()) as StateSnapshot & { error?: string };
+              if (!res.ok) throw new Error(data.error ?? `HTTP ${res.status}`);
+              applySnapshotRef.current(data); // shared shell state updates immediately, like the panes' runAction
+              statusEl.textContent = 'Relocation started.';
+            } catch (err) {
+              statusEl.textContent = err instanceof Error ? err.message : String(err);
+              button.disabled = false; // allow retry / picking another plane
+            }
+          });
+        }
       };
 
       const onPlaneClick = (e: maplibregl.MapLayerMouseEvent) => {
@@ -224,9 +284,9 @@ export default function FlightMap({ state, hovered }: MapProps) {
             type: 'circle',
             source: AIRPORTS_SOURCE_ID,
             paint: {
-              'circle-radius': 3,
+              'circle-radius': 5, // ISS-010 (v0.18.0): bigger — the r=3 dots were hard to click
               'circle-color': '#e11d48',
-              'circle-stroke-width': 1,
+              'circle-stroke-width': 1.5,
               'circle-stroke-color': '#ffffff',
             },
           });
@@ -317,7 +377,7 @@ export default function FlightMap({ state, hovered }: MapProps) {
             source: AIRPORTS_SOURCE_ID,
             filter: ['any', ['==', ['get', 'icao'], ''], ['==', ['get', 'icao'], '']],
             paint: {
-              'circle-radius': 8, // ring around the base airport circles (r=3)
+              'circle-radius': 9, // ring around the base airport circles (r=5)
               'circle-color': 'rgba(0, 0, 0, 0)', // transparent fill — stroke-only ring
               'circle-stroke-width': 2.5,
               'circle-stroke-color': '#facc15',

components/RightPane.tsx

@@ -1,6 +1,7 @@
 'use client';
 
-import { useCallback, useEffect, useState } from 'react';
+import { useCallback, useEffect, useRef, useState } from 'react';
+import type { GeoJsonFeatureCollection } from '@/lib/airports';
 import type { PackageState, PlaneState, StateSnapshot } from '@/lib/game/state';
 import { PLANE_TYPES } from '@/lib/game/catalog';
 import { abandonPenalty } from '@/lib/game/penalty';
@@ -122,6 +123,32 @@ 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
@@ -182,6 +209,11 @@ 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;
@@ -422,6 +454,48 @@ export default function RightPane({ state, loading, applySnapshot, onHover, onEr
             Refuel to full
           </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>
       </section>
 
       {actionError && <p data-testid="right-error" className="pane-error">{actionError}</p>}

e2e/actions.spec.ts

@@ -117,6 +117,9 @@ async function flyHomeViaApi(page: Page): Promise<void> {
     plane = s.planes.find((p) => p.id === 'plane-starter')!;
   }
   if (plane.locationIcao !== HUB) {
+    // ISS-011: the landing above auto-slown the sim to 1× — re-set SCALE so the return leg
+    // fast-forwards instead of taking real-time hours.
+    await setScale(page, SCALE);
     const res = await page.request.post(`/api/planes/${plane.id}/fly`, { data: { destIcao: HUB } });
     expect(res.ok()).toBeTruthy(); // repositioning needs no package (v0.12.0 manual flight)
     await expect.poll(async () => ((await getState(page)).planes.find((p) => p.id === 'plane-starter')!.locationIcao), { timeout: 240_000 }).toBe(HUB);
@@ -221,7 +224,9 @@ test('full core loop via UI: load → fly to destination → exact reward + rep
   const refuelCost = Math.round((afterRefuel.maxFuel - landed.fuel) * FUEL_PRICE_PER_L * 100) / 100;
   expect(s.account.cash).toBeCloseTo(before.account.cash + pkg.reward - refuelCost, 6);
 
-  // Restore: fly home (repositioning — no package needed in the v0.12.0 model).
+  // Restore: fly home (repositioning — no package needed in the v0.12.0 model). ISS-011: the
+  // arrival above auto-slown the sim to 1×, so re-set SCALE for the return leg.
+  await setScale(page, SCALE);
   const homeRes = await page.request.post(`/api/planes/${planeId}/fly`, { data: { destIcao: HUB } });
   expect(homeRes.ok()).toBeTruthy();
   await expect.poll(async () => ((await getState(page)).planes.find((p) => p.id === planeId)!.locationIcao), { timeout: 120_000 }).toBe(HUB);
@@ -308,8 +313,10 @@ test('expired packages deliver and abandon with no reward and no penalty', async
   expect(s.packages.find((p) => p.id === pkgB.id)!.status).toBe('abandoned');
   expect(s.account.cash).toBe(cashBeforeAbandon); // free — expired abandons cost nothing
 
-  // Restore: refuel + fly home (scale is still SCALE from the expiry wait above).
+  // Restore: refuel + fly home. ISS-011: the LEMD arrival above auto-slown the sim to 1×, so
+  // re-set SCALE for the return leg (the expiry wait's scale no longer persists past a landing).
   await page.request.post('/api/planes/plane-starter/refuel');
+  await setScale(page, SCALE);
   const homeRes = await page.request.post('/api/planes/plane-starter/fly', { data: { destIcao: HUB } });
   expect(homeRes.ok()).toBeTruthy();
   await expect.poll(async () => ((await getState(page)).planes.find((p) => p.id === 'plane-starter')!.locationIcao), { timeout: 240_000 }).toBe(HUB);
@@ -347,7 +354,9 @@ test('load and fly validation paths (404 / 409 / 400)', async ({ page }) => {
   res = await page.request.post(`/api/packages/${pkg.id}/abandon`);
   expect(res.status()).toBe(409);
 
-  // Fly home from the hop so the fuel section starts at the hub.
+  // Fly home from the hop so the fuel section starts at the hub. ISS-011: the hop arrival above
+  // auto-slown the sim to 1×, so re-set SCALE for this leg.
+  await setScale(page, SCALE);
   res = await page.request.post('/api/planes/plane-starter/fly', { data: { destIcao: HUB } });
   expect(res.ok()).toBeTruthy();
   await expect.poll(async () => ((await getState(page)).planes.find((p) => p.id === 'plane-starter')!.locationIcao), { timeout: 120_000 }).toBe(HUB);
@@ -370,6 +379,8 @@ test('load and fly validation paths (404 / 409 / 400)', async ({ page }) => {
   const atFar = sFar.planes.find((p) => p.id === 'plane-starter')!;
   expect(atFar.locationIcao).toBe(FAR);
   // The return leg fits: the weighted burn over it is less than what's left in the tank.
+  // ISS-011: the FAR arrival above auto-slown the sim to 1×, so re-set SCALE for this leg.
+  await setScale(page, SCALE);
   const backRes = await page.request.post('/api/planes/plane-starter/fly', { data: { destIcao: HUB } });
   expect(backRes.ok()).toBeTruthy();
   await expect.poll(async () => ((await getState(page)).planes.find((p) => p.id === 'plane-starter')!.locationIcao), { timeout: 240_000 }).toBe(HUB);

e2e/auto-slow.spec.ts

@@ -0,0 +1,130 @@
+import type { Page } from '@playwright/test';
+import { expect, test } from '@playwright/test';
+
+// v0.19.0 — ISS-011: when the LAST plane lands (no plane remains in flight) the sim auto-slows
+// to 1×, server-side and persisted on the sim_state row so the UI slider reflects it on the next
+// snapshot. Arrival-triggered by design: a grounded fleet at high scale is left alone, there is no
+// auto-restore — the player speeds up manually again (asserted below).
+
+const SCALE = 1000; // fastest sim speed — top of the v0.14.0 ladder (same convention as e2e/sim.spec.ts)
+const HUB = 'EDDF'; // Frankfurt Main — the seeded starter plane's home base (lib/game/seed.ts)
+
+interface SimState {
+  clockMs: number;
+  timeScale: number;
+  paused: boolean;
+}
+
+interface StateBody {
+  simState: SimState;
+  planes: Array<{ id: string; status: string; locationIcao: string; destIcao: string | null }>;
+}
+
+async function getState(page: Page): Promise<StateBody> {
+  const res = await page.request.get('/api/state');
+  expect(res.ok()).toBeTruthy();
+  return (await res.json()) as StateBody;
+}
+
+async function postSim(page: Page, body: Record<string, unknown>): Promise<void> {
+  const res = await page.request.post('/api/sim', { data: body });
+  expect(res.status()).toBe(200);
+}
+
+// Set the time scale and VERIFY from the response that it stuck — if something external ever
+// resets the live instance's controls mid-test, fail loudly here instead of timing out later.
+async function setScale(page: Page, scale: number): Promise<void> {
+  const res = await page.request.post('/api/sim', { data: { timeScale: scale } });
+  expect(res.status()).toBe(200);
+  const body = (await res.json()) as SimState;
+  expect(body.timeScale, `timeScale should be ${scale} after POST /api/sim`).toBe(scale);
+}
+
+// Closest airport to the hub from /api/airports → shortest possible leg (fastest e2e flight).
+async function nearestToHub(page: Page): Promise<{ icao: string }> {
+  const res = await page.request.get('/api/airports');
+  expect(res.ok()).toBeTruthy();
+  const fc = (await res.json()) as { features: Array<{ properties: { icao: string; lat: number; lon: number } }> };
+  const hub = fc.features.find((f) => f.properties.icao === HUB)!.properties;
+  let nearest = fc.features.filter((f) => f.properties.icao !== HUB)[0].properties;
+  for (const f of fc.features) {
+    if (f.properties.icao === HUB) continue;
+    const d = Math.hypot(f.properties.lat - hub.lat, f.properties.lon - hub.lon);
+    const dn = Math.hypot(nearest.lat - hub.lat, nearest.lon - hub.lon);
+    if (d < dn) nearest = f.properties;
+  }
+  return { icao: nearest.icao };
+}
+
+// Self-heal helper (same pattern as e2e/relocation.spec.ts): let any in-flight leg finish and
+// reposition plane-starter home via the API so every test starts from the canonical state even
+// after an interrupted previous run.
+async function flyHomeViaApi(page: Page): Promise<void> {
+  let s = await getState(page);
+  let plane = s.planes.find((p) => p.id === 'plane-starter')!;
+  if (plane.status === 'flying' || plane.locationIcao !== HUB) {
+    // Fast-forward any leftover leg / repositioning flight (~20 s real time worst case at 1000×).
+    await setScale(page, SCALE);
+  }
+  if (plane.status === 'flying') {
+    // Let the in-flight leg finish before repositioning. While flying, locationIcao stays at the
+    // DEPARTURE airport — re-read state after landing before deciding whether a repositioning
+    // flight is needed.
+    await expect.poll(async () => ((await getState(page)).planes.find((p) => p.id === 'plane-starter')!.status), { timeout: 240_000 }).toBe('available');
+    s = await getState(page);
+    plane = s.planes.find((p) => p.id === 'plane-starter')!;
+  }
+  if (plane.locationIcao !== HUB) {
+    // ISS-011: the landing above auto-slown the sim to 1× — re-set SCALE so the return leg
+    // fast-forwards instead of taking real-time hours.
+    await setScale(page, SCALE);
+    const res = await page.request.post(`/api/planes/${plane.id}/fly`, { data: { destIcao: HUB } });
+    expect(res.ok()).toBeTruthy(); // repositioning needs no package (v0.12.0 manual flight)
+    await expect.poll(async () => ((await getState(page)).planes.find((p) => p.id === 'plane-starter')!.locationIcao), { timeout: 240_000 }).toBe(HUB);
+  }
+}
+
+// Self-heal in CLEANUP (afterEach): the test deliberately leaves plane-starter at the far end, so
+// fast-forward + reposition home here; then restore scale=1 / unpaused for later specs.
+test.afterEach(async ({ page }) => {
+  await flyHomeViaApi(page);
+  await postSim(page, { timeScale: 1, paused: false });
+});
+
+test.describe.configure({ mode: 'serial' }); // shared live DB — order matters within this file
+
+test('auto-slow to 1× when the last plane lands; manual speed-up still works (ISS-011)', async ({ page }) => {
+  test.setTimeout(300_000); // self-heal (worst case ~20 s at 1000×) + one short leg
+  await flyHomeViaApi(page); // deterministic: the starter sits grounded at EDDF
+
+  const nearest = await nearestToHub(page);
+
+  // Set 1000× via the API and verify it stuck.
+  await setScale(page, SCALE);
+
+  // Dispatch plane-starter on the shortest leg from its hub (repositioning — no package needed).
+  const flyRes = await page.request.post('/api/planes/plane-starter/fly', { data: { destIcao: nearest.icao } });
+  expect(flyRes.status()).toBe(200);
+
+  // Wait for the landing…
+  let landedBody: StateBody | undefined;
+  await expect
+    .poll(async () => {
+      const b = await getState(page);
+      const p = b.planes.find((x) => x.id === 'plane-starter')!;
+      if (p.status === 'available' && p.locationIcao === nearest.icao) landedBody = b;
+      return !!landedBody;
+    }, { timeout: 120_000, message: `waiting for plane-starter to land at ${nearest.icao}` })
+    .toBe(true);
+
+  // …and the server has auto-slown to 1× — persisted on sim_state, so this very snapshot shows it.
+  expect(landedBody!.simState.timeScale).toBe(1);
+
+  // Manual override still works: POST /api/sim {timeScale: 1000} → confirmed by the response…
+  const post = await page.request.post('/api/sim', { data: { timeScale: SCALE } });
+  expect(post.status()).toBe(200);
+  expect(((await post.json()) as SimState).timeScale).toBe(SCALE);
+  // …and by a fresh snapshot (no auto-restore of the previous scale — and no re-slow either,
+  // since nothing is in flight: the trigger is arrival-based, not idle-enforcement).
+  expect((await getState(page)).simState.timeScale).toBe(SCALE);
+});

e2e/hover.spec.ts

@@ -89,6 +89,9 @@ async function flyHomeViaApi(page: Page): Promise<void> {
       .toBe(true);
   }
   if (starter.locationIcao !== HUB) {
+    // ISS-011: the landing above auto-slown the sim to 1× — re-set SCALE so the return leg
+    // fast-forwards instead of taking real-time hours.
+    await setScale(page, SCALE);
     const res = await page.request.post('/api/planes/plane-starter/fly', { data: { destIcao: HUB } });
     expect(res.status()).toBe(200); // repositioning needs no package (v0.12.0 manual flight)
     await expect
@@ -291,6 +294,8 @@ test('hovering an on-board block of a flying plane highlights its route', async
     }, { timeout: 120_000, message: `waiting for plane-starter to land at ${DEST}` })
     .toBe(true);
 
+  // ISS-011: the arrival above auto-slown the sim to 1×, so re-set SCALE for this leg.
+  await setScale(page, SCALE);
   const home = await page.request.post('/api/planes/plane-starter/fly', { data: { destIcao: HUB } });
   expect(home.status()).toBe(200);
   await expect

e2e/relocation.spec.ts

@@ -0,0 +1,189 @@
+import type { Page } from '@playwright/test';
+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
+// (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.
+
+const SCALE = 1000; // fastest sim speed (v0.14.0 ladder top) — keeps cleanup flights to seconds of real time
+const HUB = 'EDDF'; // Frankfurt Main — the seeded starter plane's home base (lib/game/seed.ts)
+// LFRS Nantes Atlantique — same isolated marker as e2e/map.spec.ts: its nearest neighbour is ~78 px
+// away at the initial zoom, so a click on its projected center cannot hit another circle.
+const POPUP_AIRPORT = { icao: 'LFRS', lon: -1.61073, lat: 47.153198 };
+
+interface StateBody {
+  planes: Array<{ id: string; status: string; locationIcao: string; destIcao: string | null }>;
+}
+
+async function getState(page: Page): Promise<StateBody> {
+  const res = await page.request.get('/api/state');
+  expect(res.ok()).toBeTruthy();
+  return (await res.json()) as StateBody;
+}
+
+async function postSim(page: Page, body: Record<string, unknown>): Promise<void> {
+  const res = await page.request.post('/api/sim', { data: body });
+  expect(res.ok()).toBeTruthy();
+}
+
+// Set the time scale and VERIFY from the response that it stuck — if something external ever
+// resets the live instance's controls mid-test, fail loudly here instead of timing out later.
+async function setScale(page: Page, scale: number): Promise<void> {
+  const res = await page.request.post('/api/sim', { data: { timeScale: scale } });
+  expect(res.status()).toBe(200);
+  const body = (await res.json()) as { timeScale: number };
+  expect(body.timeScale, `timeScale should be ${scale} after POST /api/sim`).toBe(scale);
+}
+
+// Closest airport to the hub from /api/airports → shortest possible leg (fuel trivial).
+async function nearestToHub(page: Page): Promise<{ icao: string }> {
+  const res = await page.request.get('/api/airports');
+  expect(res.ok()).toBeTruthy();
+  const fc = (await res.json()) as { features: Array<{ properties: { icao: string; lat: number; lon: number } }> };
+  const hub = fc.features.find((f) => f.properties.icao === HUB)!.properties;
+  let nearest = fc.features.filter((f) => f.properties.icao !== HUB)[0].properties;
+  for (const f of fc.features) {
+    if (f.properties.icao === HUB) continue;
+    const d = Math.hypot(f.properties.lat - hub.lat, f.properties.lon - hub.lon);
+    const dn = Math.hypot(nearest.lat - hub.lat, nearest.lon - hub.lon);
+    if (d < dn) nearest = f.properties;
+  }
+  return { icao: nearest.icao };
+}
+
+// Self-heal helper (same pattern as e2e/actions.spec.ts): let any in-flight leg finish and
+// reposition plane-starter home via the API — repositioning needs no package (v0.12.0 manual
+// flight) — so every test starts from the canonical state even after an interrupted previous run.
+async function flyHomeViaApi(page: Page): Promise<void> {
+  let s = await getState(page);
+  let plane = s.planes.find((p) => p.id === 'plane-starter')!;
+  if (plane.status === 'flying' || plane.locationIcao !== HUB) {
+    // Fast-forward any leftover leg / repositioning flight (~20 s real time worst case at 1000×).
+    await setScale(page, SCALE);
+  }
+  if (plane.status === 'flying') {
+    // While flying, locationIcao stays at the DEPARTURE airport — re-read state after landing
+    // before deciding whether a repositioning flight is needed.
+    await expect.poll(async () => ((await getState(page)).planes.find((p) => p.id === 'plane-starter')!.status), { timeout: 240_000 }).toBe('available');
+    s = await getState(page);
+    plane = s.planes.find((p) => p.id === 'plane-starter')!;
+  }
+  if (plane.locationIcao !== HUB) {
+    // ISS-011: the landing above auto-slown the sim to 1× — re-set SCALE so the return leg
+    // fast-forwards instead of taking real-time hours.
+    await setScale(page, SCALE);
+    const res = await page.request.post(`/api/planes/${plane.id}/fly`, { data: { destIcao: HUB } });
+    expect(res.ok()).toBeTruthy(); // repositioning needs no package (v0.12.0 manual flight)
+    await expect.poll(async () => ((await getState(page)).planes.find((p) => p.id === 'plane-starter')!.locationIcao), { timeout: 240_000 }).toBe(HUB);
+  }
+}
+
+// Self-heal in CLEANUP (afterEach): the tests deliberately leave plane-starter mid-flight, so
+// fast-forward + reposition home here; then restore scale=1 / unpaused for later specs.
+test.afterEach(async ({ page }) => {
+  await flyHomeViaApi(page);
+  await postSim(page, { timeScale: 1, paused: false });
+});
+
+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.setTimeout(300_000); // self-heal (worst case ~20 s at 1000×) + one short leg
+  await flyHomeViaApi(page);
+
+  // Full tank before departure — a partially drained plane left by an earlier spec could not
+  // afford the cleanup round trip.
+  const refuel = await page.request.post('/api/planes/plane-starter/refuel');
+  expect(refuel.ok()).toBeTruthy();
+
+  const nearest = await nearestToHub(page);
+
+  await page.goto('/');
+  const planeSel = page.getByTestId('relocate-plane');
+  await expect(planeSel).toBeVisible({ timeout: 15_000 }); // pane renders once the first snapshot lands
+  await planeSel.selectOption('plane-starter');
+
+  // Destination options come from the one-time /api/airports fetch (sorted by name) — selectOption
+  // waits until the matching option exists, so this doubles as the load wait.
+  const destSel = page.getByTestId('relocate-dest');
+  await destSel.selectOption(nearest.icao);
+
+  const goBtn = page.getByTestId('relocate-go');
+  await expect(goBtn).toBeEnabled();
+  await goBtn.click();
+
+  // The click fires the fly POST asynchronously (runAction is fire-and-forget from the test's view),
+  // so poll until it took effect on the server.
+  await expect.poll(async () => {
+    const b = await getState(page);
+    const p = b.planes.find((x) => x.id === 'plane-starter')!;
+    return p.status === 'flying' && p.destIcao === nearest.icao;
+  }, { timeout: 15_000, message: 'waiting for the relocate click to take effect (status "flying" + dest set)' }).toBe(true);
+});
+
+test('airport popup offers Relocate options for grounded planes', async ({ page }) => {
+  test.setTimeout(300_000); // self-heal (worst case ~20 s at 1000×) + one leg to LFRS
+  await flyHomeViaApi(page);
+
+  const refuel = await page.request.post('/api/planes/plane-starter/refuel');
+  expect(refuel.ok()).toBeTruthy();
+
+  await page.goto('/');
+
+  // Wait until the airport count renders (airports loaded) and the map has a snapshot containing
+  // the plane — the popup's Relocate row is built from that same latest snapshot.
+  const countEl = page.getByTestId('airport-count');
+  await expect.poll(async () => {
+    const text = (await countEl.textContent()) ?? '';
+    const m = text.match(/(\d+)/);
+    return m ? parseInt(m[1], 10) : -1;
+  }, { timeout: 15_000 }).toBeGreaterThan(0);
+  await expect.poll(async () =>
+    page.evaluate(() => {
+      const m = (window as any).__flightMap;
+      if (!m || !m.getSource('planes')) return false;
+      try {
+        return m.querySourceFeatures('planes').some((f: { properties?: Record<string, unknown> }) => f.properties?.id === 'plane-starter');
+      } catch {
+        return false; // source not ready yet — keep polling
+      }
+    }),
+    { timeout: 15_000 },
+  ).toBe(true);
+
+  // Click the LFRS marker (projected center — same pattern as e2e/map.spec.ts). The constant is
+  // passed AS AN ARGUMENT: the evaluate callback runs in the browser, where Node-scope values don't exist.
+  const pt = await page.evaluate(({ lon, lat }) => {
+    const map = (window as any).__flightMap;
+    const p = map.project([lon, lat]);
+    const rect = map.getContainer().getBoundingClientRect();
+    return { x: rect.left + p.x, y: rect.top + p.y };
+  }, POPUP_AIRPORT);
+  await page.mouse.click(pt.x, pt.y);
+
+  const popup = page.getByTestId('airport-popup');
+  await expect(popup).toBeVisible();
+  await expect(popup).toContainText(POPUP_AIRPORT.icao);
+
+  // The Relocate row: a select of grounded planes + the button (disabled until one is picked).
+  const planeSel = page.getByTestId('airport-popup-plane');
+  await expect(planeSel).toBeVisible();
+  // Target THE PLANE OPTION specifically — locator('option') also matches the placeholder and
+  // trips strict mode (CI run #51).
+  await expect(planeSel.locator('option[value="plane-starter"]')).toHaveText(/ATR 72-600 — EDDF/);
+  const goBtn = page.getByTestId('airport-popup-relocate');
+  await expect(goBtn).toBeDisabled(); // placeholder selected
+
+  await planeSel.selectOption('plane-starter');
+  await expect(goBtn).toBeEnabled();
+  await goBtn.click();
+
+  await expect.poll(async () => {
+    const b = await getState(page);
+    const p = b.planes.find((x) => x.id === 'plane-starter')!;
+    return p.status === 'flying' && p.destIcao === POPUP_AIRPORT.icao;
+  }, { timeout: 15_000, message: 'waiting for the popup relocate click to take effect (status "flying" + dest set)' }).toBe(true);
+});

e2e/right-pane.spec.ts

@@ -174,6 +174,9 @@ async function flyHomeViaApi(page: Page): Promise<void> {
       .toBe(true);
   }
   if (starter.locationIcao !== HUB) {
+    // ISS-011: the landing above auto-slown the sim to 1× — re-set SCALE so the return leg
+    // fast-forwards instead of taking real-time hours.
+    await setScale(page, SCALE);
     const res = await page.request.post('/api/planes/plane-starter/fly', { data: { destIcao: HUB } });
     expect(res.status()).toBe(200); // repositioning needs no package (v0.12.0 manual flight)
     await expect
@@ -284,6 +287,8 @@ test('on-board list: fly-to-destination + abandon with penalty preview; flying p
   await expect(onboardRow).not.toBeVisible({ timeout: 15_000 });
 
   // Restore: fly home so the live instance stays in its onboarding state for the next run.
+  // ISS-011: the arrival above auto-slown the sim to 1×, so re-set SCALE for this leg.
+  await setScale(page, SCALE);
   const homeRes = await page.request.post('/api/planes/plane-starter/fly', { data: { destIcao: HUB } });
   expect(homeRes.status()).toBe(200);
   await expect
@@ -401,7 +406,9 @@ test('on-board row Refuel tops up just enough for the package leg; market button
   await expect(page.getByTestId('market-refuel')).toHaveText('Refuel to full');
 
   // Restore: fly home — pkg2's destination IS the hub, so it delivers on arrival. The tank holds
-  // exactly the leg requirement, so this also proves "just enough" is enough.
+  // exactly the leg requirement, so this also proves "just enough" is enough. ISS-011: the far-end
+  // arrival above auto-slown the sim to 1×, so re-set SCALE for this leg.
+  await setScale(page, SCALE);
   expect((await page.request.post('/api/planes/plane-starter/fly', { data: { destIcao: HUB } })).status()).toBe(200);
   await expect
     .poll(async () => (await getState(page)).planes.find((p) => p.id === 'plane-starter')?.locationIcao === HUB, {

lib/sim/engine.test.ts

@@ -237,6 +237,80 @@ describe('deliverPackages (v0.12.0 arrival delivery)', () => {
   });
 });
 
+describe('auto-slow to 1× when the last plane lands (ISS-011)', () => {
+  const FROM = 'EDDF';
+  const TO = 'LEMD';
+
+  // Starter flying EDDF→LEMD with departureSimTime set so its arrival is EXACTLY T0 —
+  // any advancing tick past T0 finalizes it. timeScale is the value under test.
+  async function setupLanding(name: string, timeScale: number) {
+    const inst = await freshDb(name);
+    const fc = await loadAirportsGeoJson();
+    const from = fc.features.find((f) => f.properties.icao === FROM)!.properties;
+    const to = fc.features.find((f) => f.properties.icao === TO)!.properties;
+    const km = haversineKm(from.lat, from.lon, to.lat, to.lon);
+    const type = PLANE_TYPES.atr72;
+
+    await inst.db.update(schema.simState).set({ timeScale });
+    await inst.db.update(schema.planes)
+      .set({ status: 'flying', destIcao: TO, departureSimTime: T0 - travelMs(km, type.speedKmh), fuel: type.maxFuel })
+      .where(eq(schema.planes.id, 'plane-starter'));
+
+    return { inst, from, km, type };
+  }
+
+  it('last plane lands → stored timeScale becomes 1', async () => {
+    const { inst } = await setupLanding('autoslow-last.db', 1000);
+    vi.setSystemTime(T0 + 2_000); // one full clamped tick at scale 1000 → clock T0+2e6 ≥ arrival (T0)
+
+    const sim = await tickOnce(inst);
+
+    expect(sim.timeScale).toBe(1); // persisted on the sim_state row…
+    expect((await inst.db.select().from(schema.simState))[0].timeScale).toBe(1); // …and visible to the next snapshot
+    expect((await inst.db.select().from(schema.planes))[0].status).toBe('available'); // landing itself unchanged
+  });
+
+  it('a landing while another plane is still flying → no change', async () => {
+    const { inst, from, type } = await setupLanding('autoslow-other.db', 1000);
+    // A second plane on the same route departing at T0 — arrives far after this tick's clock.
+    await inst.db.insert(schema.planes).values({
+      id: 'p-b', model: 'atr72', status: 'flying', fuel: type.maxFuel, maxFuel: type.maxFuel,
+      locationIcao: FROM, destIcao: TO, lat: from.lat, lon: from.lon, departureSimTime: T0,
+    });
+
+    vi.setSystemTime(T0 + 2_000);
+    const sim = await tickOnce(inst);
+
+    expect(sim.timeScale).toBe(1000); // p-b still in flight — no auto-slow
+    const byId = new Map((await inst.db.select().from(schema.planes)).map((p) => [p.id, p.status]));
+    expect(byId.get('plane-starter')).toBe('available'); // the starter did land…
+    expect(byId.get('p-b')).toBe('flying'); // …but the fleet is not idle
+  });
+
+  it('already at 1× → stays 1', async () => {
+    const { inst } = await setupLanding('autoslow-one.db', 1);
+    vi.setSystemTime(T0 + 2_000); // one tick at scale 1 advances 2e3 game ms — past the T0 arrival
+
+    const sim = await tickOnce(inst);
+
+    expect(sim.timeScale).toBe(1);
+    expect((await inst.db.select().from(schema.planes))[0].status).toBe('available');
+  });
+
+  it('paused sim with all planes landed → no change', async () => {
+    const inst = await freshDb('autoslow-paused.db');
+    // The fleet is fully grounded (the seeded starter) — a paused tick must not touch the
+    // scale even though "no plane in flight" holds: the trigger requires a landing this tick.
+    await inst.db.update(schema.simState).set({ timeScale: 1000, paused: true });
+
+    vi.setSystemTime(T0 + 5_000);
+    const sim = await tickOnce(inst);
+
+    expect(sim.timeScale).toBe(1000); // no landing processed while paused → trigger never fires
+    expect((await inst.db.select().from(schema.planes))[0].status).toBe('available');
+  });
+});
+
 describe('spawnOpenPackages', () => {
   it('tops the market up to MARKET_TARGET_OPEN_PACKAGES using the shared seed builder', async () => {
     const inst = await freshDb('spawn.db');

lib/sim/engine.ts

@@ -71,17 +71,33 @@ export async function tickOnce(inst: GameDb): Promise<schema.SimStateRow> {
   const advanceMs = sim.paused ? 0 : Math.min(elapsed, MAX_TICK_ELAPSED_MS) * sim.timeScale;
   const clockMs = Math.round(sim.clockMs + advanceMs);
 
+  let landedThisTick = 0;
   if (advanceMs > 0) {
     await expirePackages(inst, clockMs);
-    await deliverPackages(inst, clockMs);
+    // ISS-011: remember the landings so the tick can auto-slow to 1× when this was
+    // the last plane in flight.
+    landedThisTick = await deliverPackages(inst, clockMs);
     await spawnOpenPackages(inst, clockMs);
     // AFTER delivery on purpose: a plane that just landed gets work spawned
     // at its new location within the same tick.
     await spawnCoveragePackages(inst, clockMs);
   }
 
+  const sets: Partial<Pick<schema.SimStateRow, 'clockMs' | 'lastRealTickMs' | 'timeScale'>> = {
+    clockMs,
+    lastRealTickMs: nowMs,
+  };
+  // Auto-slow (ISS-011): when ≥1 plane landed this tick and NO plane remains in flight,
+  // drop the stored timeScale to 1× — persisted here so the UI slider reflects it on the
+  // next snapshot. Arrival-triggered by design: a grounded fleet at high scale is left
+  // alone (the player speeds up manually again; there is no auto-restore).
+  if (landedThisTick > 0 && !sim.paused) {
+    const flying = await inst.db.select().from(schema.planes).where(eq(schema.planes.status, 'flying'));
+    if (flying.length === 0) sets.timeScale = MIN_TIME_SCALE;
+  }
+
   // Persist lastRealTickMs even when nothing advanced — it is the tick anchor.
-  await inst.db.update(schema.simState).set({ clockMs, lastRealTickMs: nowMs });
+  await inst.db.update(schema.simState).set(sets);
   await persist(inst);
   const updated = (await inst.db.select().from(schema.simState))[0];
   if (!updated) throw new Error('sim_state row missing after tick');

package.json

@@ -1,6 +1,6 @@
 {
   "name": "flight-ops",
-  "version": "0.17.0",
+  "version": "0.19.0",
   "private": true,
   "scripts": {
     "dev": "next dev -p 3000",