This is a complete list of all airport/airfield/aerodrome IDs for use when flying the Su-25T. It has data for the following maps: Caucausus, Nevada/NTTR, Persian Gulf, and Syria. This is only a plain text file, feel free to do whatever you want with it.
These IDs were all found manually by spawning an Su-25T at every airport on the map, then checking the RTN or LNDG nav mode to show the airport ID in the HUD. I tried to make sure it was accurate, but no guarantees. I don't have the Normandy ...