diff --git a/tasks/flightradar24/compose/docker-compose.yml b/tasks/flightradar24/compose/docker-compose.yml
index ed50eef..bced517 100644
--- a/tasks/flightradar24/compose/docker-compose.yml
+++ b/tasks/flightradar24/compose/docker-compose.yml
@@ -81,6 +81,7 @@ services:
     environment:
       <<: *common-env
       SERVICE_ROLE: preprocess
+      BATCH_SIZE: "500"
     volumes:
       - ../logs/preprocess:/var/log/fr24
       - ../backup:/backup
diff --git a/tasks/flightradar24/frontend/static/index.html b/tasks/flightradar24/frontend/static/index.html
index 461bdb7..c7f1b8a 100644
--- a/tasks/flightradar24/frontend/static/index.html
+++ b/tasks/flightradar24/frontend/static/index.html
@@ -76,7 +76,8 @@ function planeIcon(heading) {
   });
 }
 
-const markers = {};  // icao24 -> L.marker
+const markers = {};   // icao24 -> L.marker
+let trackLayers = []; // active track polylines
 
 function fmt(v, unit, decimals=0) {
   if (v == null) return '—';
@@ -86,8 +87,12 @@ function fmt(v, unit, decimals=0) {
 function showPopup(props) {
   document.getElementById('pop-callsign').textContent = props.callsign || props.icao24;
   document.getElementById('pop-icao').textContent = props.icao24;
-  document.getElementById('pop-alt').textContent = fmt(props.altitude_m, 'm');
-  document.getElementById('pop-spd').textContent = fmt(props.ground_speed_kt, 'kt');
+  // altitude: m → ft
+  const altFt = props.altitude_m != null ? Math.round(props.altitude_m * 3.281) : null;
+  document.getElementById('pop-alt').textContent = altFt != null ? altFt + ' ft' : '—';
+  // speed: kt → km/h
+  const spdKmh = props.ground_speed_kt != null ? Math.round(props.ground_speed_kt * 1.852) : null;
+  document.getElementById('pop-spd').textContent = spdKmh != null ? spdKmh + ' km/h' : '—';
   document.getElementById('pop-hdg').textContent = fmt(props.heading_deg, '°');
   document.getElementById('pop-vr').textContent = fmt(props.vertical_rate_fpm, 'fpm');
   document.getElementById('pop-ts').textContent = props.observed_at
@@ -99,11 +104,42 @@ function closePopup() {
   document.getElementById('popup-box').style.display = 'none';
 }
 
+async function refreshTracks() {
+  try {
+    const res = await fetch('/api/tracks?minutes=180');
+    if (!res.ok) return;
+    const geojson = await res.json();
+    let features = geojson.features || [];
+
+    // cap at 200 tracks — keep the most recent (already ordered by last_point_at DESC)
+    if (features.length > 200) features = features.slice(0, 200);
+
+    // remove old track layers
+    for (const layer of trackLayers) map.removeLayer(layer);
+    trackLayers = [];
+
+    for (const f of features) {
+      const coords = f.geometry.coordinates.map(([lon, lat]) => [lat, lon]);
+      const callsign = f.properties.callsign || f.properties.icao24;
+      const line = L.polyline(coords, {
+        color: '#58a6ff',
+        weight: 1.5,
+        opacity: 0.4,
+      }).addTo(map);
+      line.bindPopup(callsign);
+      trackLayers.push(line);
+    }
+  } catch (_) { /* silent — tracks are non-critical */ }
+}
+
 async function refresh() {
   try {
-    const res = await fetch('/api/aircraft/live?minutes=60');
-    if (!res.ok) throw new Error('HTTP ' + res.status);
-    const geojson = await res.json();
+    const [acRes] = await Promise.all([
+      fetch('/api/aircraft/live?minutes=180'),
+      refreshTracks(),
+    ]);
+    if (!acRes.ok) throw new Error('HTTP ' + acRes.status);
+    const geojson = await acRes.json();
     const features = geojson.features || [];
     const seen = new Set();