mikasjp/FlightRadar ? reverse-engineered prompt

Build me a simple Python tool that shows what planes are flying overhead using ADS B data from ADSB Exchange.

I want to be able to run one script and get a radar.kml file that marks the airplanes in a chosen area, so I can open it in a map viewer and see the flights visually. Keep it easy to use, like a small utility for checking nearby aircraft, not a full app. If it helps, include a sample output or simple way to preview the map, and make sure it works with the usual Python requests and simplekml libraries.

Please keep the code clean and straightforward, and if you need anything current from the docs or API details, look it up online.