Wow! Sounds fun!
I would think different classes would be a good idea since you will have many types of airplanes there.... Here are my initial thoughts:


Prop. planes: Quickee/pylon, Warbird, and sport (Prop jets, fast pattern planes etc.) Maybe broken up based on disp. like up to .40 glow then 40-60 glow then "open" for anything bigger-

Ducted fans

Turbines