A number of airplanes I have downloaded and placed in the airplane files are there but they do not come up in the program when I want to select them to fly. Is there a problem with the .Air or am I just doing something wrong. I follow the instructions and still do not get the plane in the FSX selection screens.
In the section where you choose the aircraft put a checkmark in the box marked "Show all Variations".
See if that does it.