It's here: https://globe.adsbexchange.com/?icao=a835af
The source code for the bot: https://github.com/Jxck-S/plane-notify
ADSBexchange (and FlightRadar and several other orgs) are just tracking the public broadcasts each plane makes every second with its location, altitude, airspeed, etc. https://en.wikipedia.org/wiki/Automatic_Dependent_Surveillan...