New top-level TabView (RootView) splits the app into:
Tab 1 (Search): existing RoutePlannerView home
Tab 2 (Live): live flight tracker
Live tab features:
- MapKit map showing every aircraft in the visible viewport, rotated
to true heading. Color-coded by vertical state: climbing/level/
descending/on-ground.
- Auto-refresh every 15s + on map pan/zoom (debounced); manual
refresh button. Rate-limit aware (60s backoff on HTTP 429).
- Tap any aircraft → modal sheet with live state grid (altitude,
speed, heading, vertical rate, squawk, last-contact), current
route (lazily fetched per-aircraft from OpenSky's /flights/
aircraft endpoint, mapped from ICAO to IATA airport codes), and
recent flight history (up to 8 prior legs).
- Filters: airline (multi-select from currently visible callsigns,
with counts), aircraft type (ADS-B emitter category), airborne-
only toggle. All filters render as horizontal chips and clear
with a single tap.
- Search bar: callsign/flight number — submitting centers the map
on the match and opens its detail sheet.
Data source: OpenSky Network REST API. Free, anonymous (~100 req/
day cap), JSON. Same ADS-B data FR24 starts with — without satellite
ADS-B coverage but more than enough for the in-flight tracker use
case. Reviewed FR24's APK and confirmed they migrated their live
feed to gRPC+protobuf with anti-bot device-id headers; OpenSky's
plain JSON is the right tradeoff for our build.
Implementation:
- LiveAircraft model: decodes OpenSky's mixed-type position arrays
into a typed struct; computed properties for ft/knots/heading and
airline ICAO extracted from callsign.
- OpenSkyClient: actor with /states/all + /flights/aircraft. Bbox
query, throttle-aware errors.
- AircraftRegistry: ~80 ICAO → (IATA, name) entries for the major
carriers; everything else falls through to the raw ICAO code.
- LiveFlightsView: the main map + filter UI.
- LiveFlightDetailSheet: tap modal with live state + route history.
- RootView: TabView wrapping RoutePlannerView (Search) and the new
LiveFlightsView (Live).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Trey T
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