How do you use a plane that is in AIA (or AI, whichever) format? I heard they don't show up on the "Select A Plane" screen.
I figured it out myself. There is this great program called AirEd. It edits the .air files, so you can change AIA planes to regular, and vice-versa. You can get it on www.avsim.com by searching for AirEd, or William M. Roth.