Lots of people say that you can not make airplanes for fs2002 and they say that you need fs2002 professional edition...But they are wrong! Google search for FSModelExp.dle and download it and put it in your gmax\plugins folder then google for makemdl.exe and copy that into your gmax\plugins folder. Now going under the file menu then export as .bgl fs scenery or .mdl for aircraft.
~hope this helps you.
Happy modeling!