Comment by neartheplain

Reminder that with a ~$25 software-defined radio (SDR) dongle you can receive any aircraft’s ADS-B signal, complete with position, altitude, velocity, and flight ID:

https://en.wikipedia.org/wiki/Automatic_Dependent_Surveillan...

https://www.rtl-sdr.com/adsb-aircraft-radar-with-rtl-sdr/