As far as cheating, I doubt it. The folks at HTC work very hard to squash any cheating detected in AH.
As far as unexplainable maneuvers, there aren't any. What happens is that some people know how to manage their energy/speed very well. I know what to do in the F6F to keep my speed up and how to drop it fast if needed (not because I am anyhting special, its just pretty much the only plane that I fly in AH so I know what it can and can't do). I have had people accuse me of cheating because I catch certain planes. What they don't see is what I did to put myself in a position to do this. This is the same thing that other people do in the other various "dweeb" planes. Some of the stuff may seem right out of Pearl Harbor fantasy, but once you start doing it, you will see that there is truly nothing out of the realm of possibility being done.