Claude turns flight data into "look behind you"

Claude built a Mac app that tells you when to look up, and where. Type your address, sketch the trees and rooftops around your yard, and it watches the live air traffic overhead, does the physics (including how long the sound takes to reach you), and counts you down out loud: "Look east... in view in five, four, three..." A plane only counts if it will actually clear your treeline; one hidden behind your house gets "listen," not "look." Every aircraft on screen is real, live traffic.

The data:
- Live aircraft positions: crowd-sourced ADS-B via the community aggregators adsb.lol and adsb.fi, the public radio broadcasts every transponder-equipped aircraft transmits
- Flight routes: adsb.lol's community route database
- Ground elevation: Open-Meteo
- Geocoding, maps, and the voice: Apple's on-device frameworks

Thanks to the volunteer ADS-B community, thousands of hobbyist antennas, for keeping this data open to everyone.