down my list here...
Lancs through BH.
Any fighter through any FH or BH rightside or upside down.
190s,A6m,LA7 through VH
Land anything on carrier(262,AR234 were hardest)
262 doing all kinds a stunts (1 time in MA tried it and a p47 that was following me suddenly seen my tracers flying at him as i flipped around. LOL funny as hell)
landing backwards on a carrier. Taking off carrier with bombers is also fun.
Not sure what else thats all i can think of at the moment