Adding Airlines

Hi Guys:
Right then!
In FS9 i added an additional pile of airline / callsigns to make the default ATC a bit more realistic. Is it possible to do this in FSX yet?
Cheers
Paul
Right then!
In FS9 i added an additional pile of airline / callsigns to make the default ATC a bit more realistic. Is it possible to do this in FSX yet?
Cheers
Paul