[altgoogler]

Almost all aircraft are equipped with ADS-B transponders, which transmit their tail number and location continuously. Anybody can buy a ADS-B receiver and see info for aircraft flying near them.

In good internet fashion, people figured out that they can coordinate large networks of receivers, which basically centralizes a nationwide database of all aircraft movement.

So, all this account did was tweet when Elon's jet moved from this central ADS-B database.

[yakubin]

That’s not what I’m asking though. I’m asking how they know which jet is Musk’s.