can you fly anything you want? how about a speedy sr71 lol

No, you can't.The traditional rule is a maximum of 4 reciprocating propellor engine aircraft, or twin turboprop aircraft. No jets of any kind unless specifically allowed by a specially-mandated corridor determined by the rules committee prior to the race. Thus, the only aircraft we can use are piston props with up to 4 engines, or turboprops with up to 2 engines.We won't know what this year's special corridors are until the official rules are released, which will probably be about a week or less before the race start.

ahhhh ok :)