A couple of people have mentioned AirWrench, most recently copperpen in his post #11 to this thread. His observation that the program will put stuff into aircraft.cfg files got my attention so I decided to do a little checking ...
AirWrench is available here. It's freeware after all and it appears to be very powerful. It covers CFS2/3 and FS2002 through FSX. According to the site front page it will even construct .air files based on information in aircraft.cfg files. (I hope I have that right.) The only significant developer license restriction is that its output must not be used for commercial/payware purposes, neither at the aircraft level nor at the level of individual aircraft.cfg or .air files.
After copperpen completes his use of AirWrench on his DH 86 Express, I'm going to followup by using the Cantu/Fox/Probst fsOC 727-200 airframe as a test case. Like copperpen I don't know much about this stuff. Like copperpen I want to learn.
Please feel free to join this discussion whether or not you know anything about AirWrench per se. I hope that AirWrench will help us demythologize .air files, just as I hope that this forum will, among other things, help us demythologize aircraft.cfg files and panel.cfg files.