Allow me to present to you Warpspeed, a .99 cent tilt-controlled flight game for the iPhone and iPad. There are three level varieties with 2D and 3D tracks and the ability to build your own courses. For those of you that enjoy a little competition there are leaderboards and challenges to complete as well.
BorderlineInteractive also has a game called Chaos up in the apps store if you're curious about their games, though its only for the iPhone. If that is not quite your speed (do you see what I did there?) but you want a flight game, there are other options.