This could be set within the FSX menus. I know that in FS2004 you can designate a registration number when creating a flight (the menu where you choose your aircraft).
Take a look and see if that's the case in FSX too. If so, just change it what you prefer in the field and see if the new registration appears in game.


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You just edit your aircraft.cfg file then go to the line where it sais atc_id= and change the number then save the file. That is all there is to it. If you don't want any then you just delete the existing number. That's it 


