... use the ATC ID in the aircraft.cfg; plain black, small.
Are you aware that you can customize the size and color of the default reg numbers?
The parameters for the aircraft.cfg are explained in the "Aircraft Container SDK". You can get a download link here - http://support.microsoft.com/kb/555857
Another handy guide for changing the color is available here - http://library.avsim.net/esearch.php?DLID=43809
It will show you how to have 16 million color choices for your reg numbers for the default planes.
Hope this helps.
cheers,
Joe
P.S. Nice pics BTW. And the default FS9 Baron feathers it's props every time you shut it done. Pretty sure the real ones don't do that.
[color=#000000]No Joe, I was not aware. But I am now, thanks to you. Much appreciated.