I think a portion of this has been touched on somewhere on here. But I decided to go all out. Hopefully see improvements in an update or the beta on the calculations for some of these. :)

AIRCRAFT: For the most part helicopters fly pretty well, should be more limitations on the rolling past certain degrees. Watching people do backflips, while fun to do and see done, there are only a very few helicopters that can actually pull off flips or barrel rolls. Even if the 'copter is rated to do those manuevers it would require ALOT of altitude.

GRAVITY: The aircraft, even though it weighs tons more than most other objects on the map, they somehow seem to be able to glide to the ground when the engine cuts off from being shot or if you simple shut it off and sit in it while it falls slowly to the ground. It may even land itself with minimal damage.

DAMAGE: I also watched a heli take 3 direct hits from AA rockets. The engines spun down and they landed perfectly on mountain, and their whole squad lived. But then again, I can take the engine or tail rotor out with my 7.62 EBR with ease. AA rockets should be a little more effective in damaging at least instruments/tail or main rotor assemblies.