what kinda genra and age are you looking for? ww1,ww2,80's,2000 and up ?
A variety of all genra and age would be nice here are some of my favorite aircraft P51-D Mustang, GeeBee, Piper Cub, Cessna 150, Aerocana Champion, Bell 47G Helicopter, Autogyro like the one in pilot wings. The hangers and airports is a nice idea to, this type of aviation collection would be great for someone trying to make a flight sim.
Here is link to a website that has hundreds of all different kinds of aircraft and helicopter 3 views.
http://www.suurland.com/blueprints_archive.php