diff --git a/e2e/map-interactions.spec.ts b/e2e/map-interactions.spec.ts
index 2469a41..b8e69ae 100644
--- a/e2e/map-interactions.spec.ts
+++ b/e2e/map-interactions.spec.ts
@@ -487,20 +487,32 @@ test('plane marker stays continuous across the antimeridian (no 360° teleport)'
     await page.reload();
     await waitForAirportCount(page);
 
-    // The crossing package + dispatch.
+    // The crossing package + dispatch. RUN-179 DATA COLLECTION: server-side truth is logged at every
+    // phase (unconditionally — Playwright puts test stdout in the job log for failed tests), so a failed
+    // run shows exactly what /api/state said while the browser source was sampled.
+    const fmtPlane = (p: PlaneState) => `status=${p.status} loc=${p.locationIcao} dest=${p.destIcao ?? '-'} lat=${p.lat.toFixed(4)} lon=${p.lon.toFixed(4)}`;
     await setFuelFull(page, 'plane-starter');
     const pkg = await createPackage(page, ORIGIN, CROSS_DEST);
     expect((await page.request.post(`/api/packages/${pkg.id}/load`, { data: { planeId: 'plane-starter' } })).status()).toBe(200);
+    console.log(`[antimeridian] pkg=${pkg.id} leg ${ORIGIN}->${CROSS_DEST}; BEFORE dispatch: ${fmtPlane((await getState(page)).planes.find((x) => x.id === 'plane-starter')!)}`);
     const fly = await page.request.post('/api/planes/plane-starter/fly', { data: { destIcao: CROSS_DEST } });
     if (fly.status() !== 200) throw new Error(`dispatch POST /api/planes/plane-starter/fly → ${fly.status()} (expected 200)`);
     await setScale(page, SCALE);
+    console.log(`[antimeridian] AFTER dispatch: ${fmtPlane((await getState(page)).planes.find((x) => x.id === 'plane-starter')!)}`);
 
     // querySourceFeatures only sees LOADED tiles — the default view is over Europe and this leg is in the
     // Pacific: fit the camera over both endpoints first or the plane feature never appears in queries.
     await fitToAirports(page, [ORIGIN, CROSS_DEST]);
 
-    // Wait until the map's planes source shows it flying (the source updates from ~1 s state polls).
-    await expect.poll(async () => (await starterMarker(page))?.flying ?? false, { timeout: 15_000, message: 'waiting for the flying plane feature in the planes source' }).toBe(true);
+    // Wait until SERVER state shows plane-starter flying on THIS specific leg (origin/dest pair match) AND
+    // the planes source agrees. A marker-only poll could pass on a stale FLYING frame from an earlier hop;
+    // sampling must start only when this leg is actually underway server-side.
+    await expect.poll(async () => {
+      const p = (await getState(page)).planes.find((x) => x.id === 'plane-starter')!;
+      if (!(p.status === 'flying' && p.locationIcao === ORIGIN && p.destIcao === CROSS_DEST)) return false;
+      return (await starterMarker(page))?.flying ?? false;
+    }, { timeout: 30_000, message: `server must show plane-starter flying ${ORIGIN}->${CROSS_DEST} AND the planes source must show it flying` }).toBe(true);
+    console.log(`[antimeridian] FLYING first observed (server): ${fmtPlane((await getState(page)).planes.find((x) => x.id === 'plane-starter')!)}`);
 
     // Sample the marker's longitude while it crosses. Stop once the SERVER says landed; record only
     // FLYING frames — a grounded frame snaps back to the raw airport coordinate (−175.1), the same screen
@@ -510,20 +522,48 @@ test('plane marker stays continuous across the antimeridian (no 360° teleport)'
     // only frames within ~700 km of where the SERVER says the plane is (~5 s of flight at ×1000); haversine
     // is ±360°-periodic in Δlon, so wrapped server lon vs unwrapped marker lon compare directly.
     const lons: number[] = [];
+    const lats: number[] = [];
+    let rawSamples = 0;
+    const rejected: string[] = [];
+    const acceptedDetail: string[] = [];
     for (;;) {
       const p = (await getState(page)).planes.find((x) => x.id === 'plane-starter')!;
       if (p.status !== 'flying') break;
+      rawSamples++;
       const marker = await starterMarker(page);
-      if (marker?.flying && haversineKm(p.lat, p.lon, marker.lat, marker.lon) < 700) lons.push(marker.lon);
+      if (!marker || !marker.flying) {
+        rejected.push(`raw#${rawSamples} server(${p.lat.toFixed(4)},${p.lon.toFixed(4)}) marker=${marker ? `not-flying (${marker.lat.toFixed(4)},${marker.lon.toFixed(4)})` : 'null'}`);
+      } else {
+        const d = haversineKm(p.lat, p.lon, marker.lat, marker.lon);
+        if (d < 700) {
+          lons.push(marker.lon);
+          lats.push(marker.lat);
+          // Δlon ≈ 0 → source tracks the wrapped server lon (unwrap NOT applied or pre-crossing);
+          // Δlon ≈ +360 post-crossing → unwrap IS applied to what starterMarker reads.
+          acceptedDetail.push(`server(${p.lat.toFixed(4)},${p.lon.toFixed(4)}) source(lon=${marker.lon.toFixed(4)} lat=${marker.lat.toFixed(4)}) Δlon=${(marker.lon - p.lon).toFixed(2)}`);
+        } else {
+          rejected.push(`raw#${rawSamples} server(${p.lat.toFixed(4)},${p.lon.toFixed(4)}) marker(${marker.lat.toFixed(4)},${marker.lon.toFixed(4)}) dist=${d.toFixed(1)}km ≥700`);
+        }
+      }
       await page.waitForTimeout(500);
     }
 
-    expect(lons.length).toBeGreaterThan(3); // a real flight window of FRESH frames (stale ones are gated out above), not a degenerate one
+    // Unconditional diagnostics (run-179): full arrays + raw/accepted/rejected counts, so the failure log
+    // maps directly to a cause: constant ≈174.8 → frozen pre-crossing frame; values below −180 → westward
+    // unwrap; > 180 with Δlon≈+360 → correct eastward unwrap; empty after gate → source never fresh.
+    console.log(`[antimeridian] sampled lons (n=${lons.length}): ${JSON.stringify(lons)}`);
+    console.log(`[antimeridian] sampled lats (n=${lats.length}): ${JSON.stringify(lats)}`);
+    console.log(`[antimeridian] raw samples=${rawSamples} accepted=${lons.length} rejected=${rejected.length}`);
+    for (const r of rejected) console.log(`[antimeridian] REJECTED: ${r}`);
+    const detail = acceptedDetail.length <= 10 ? acceptedDetail : [...acceptedDetail.slice(0, 5), '…', ...acceptedDetail.slice(-5)];
+    for (const a of detail) console.log(`[antimeridian] ACCEPTED: ${a}`);
+
+    expect(lons.length, `sampled lons (n=${lons.length}): ${JSON.stringify(lons)}; rejected: ${rejected.join(' | ')}`).toBeGreaterThan(3); // a real flight window of FRESH frames (stale ones are gated out above), not a degenerate one
     for (let i = 1; i < lons.length; i++) {
       expect(Math.abs(lons[i]! - lons[i - 1]!), `marker jumped between samples ${i - 1} and ${i}`).toBeLessThan(180); // the ISS-124 bug
     }
-    expect(lons.some((lon) => lon > 180)).toBe(true); // crossed onto the east world copy (NZAA→NFTF is eastward)
-    expect(Math.max(...lons) - Math.min(...lons)).toBeGreaterThan(4); // traversed the crossing region, not a static window
+    expect(lons.some((lon) => lon > 180), `sampled lons (n=${lons.length}): ${JSON.stringify(lons)}`).toBe(true); // crossed onto the east world copy (NZAA→NFTF is eastward)
+    expect(Math.max(...lons) - Math.min(...lons), `lon span: min=${Math.min(...lons).toFixed(4)} max=${Math.max(...lons).toFixed(4)} over ${JSON.stringify(lons)}`).toBeGreaterThan(4); // traversed the crossing region, not a static window
   } finally {
     // Cleanup: let any in-flight leg land, then chain back home so the other specs start from the canonical
     // state. The package was delivered on arrival (generous deadline).