There are, however, many other models out there that have never gotten used or have been given out for public domain use. Go to
www.freeflightdesign.com and check out there section of downloads. Especially pay attention to Milton Shupe's stuff on there. He's one of the greatest designers of Flight Sim aircraft out there, and he has released some of his cool stuff for learning tools. You might also be interested in
www.turbosquid.com, which has a large amount of gMax material to sift through. Also remember that you can find converters for just about any media so that you aren't locked down by having to use crude or low-grade stuff that was specifically created in gMax.