http://www.3dcafe.com/asp/air_pic.asp
This location has three....
shuttle1.zip 3DS 28Kb (U.S. Space Shuttle)
shuttle2.zip 3DS 20Kb (U.S. Space Shuttle)
shuttle3.zip LWO 286Kb (U.S. Space Shuttle)
http://www.lwg3d.org/v3/meshes.php?cat=6
Very good model in LW format...
http://www.3dlinks.com
Misc. Model links.....
