In case someone doesn't know and wants to change the license plate since we all have the same we have to go here or where they have the planes
C:\Users\frang\AppData\Local\Packages\Microsoft.FlightSimulator_8wekyb3d8bbwe\LocalCache\Packages\Official\OneStore\asobo-aircraft-a320-neo\SimObjects\AirPlanes\Asobo_A320_NEO
and in Aircraft.cfg atc_id = "WRITE HERE" ; tail number