Fighter pilot games are almost always fun and I've wasted a zillion hours playing a bunch of them over the years. DumbGames.net's 3-D Fighter Pilot: Guns of War doesn't add anything to the genre, but it plays okay.
iPhone and iPad apps tagged "flight simulators."
Biiplane Offers Good Flight; Little Else
Biiplane is a flying app that will test your ability to maneuver your iPhone or iPod Touch through a simplistic obstacle course. It works well as a flight simulator through its use of the accelerometer.
X-Plane 9: Flight Simulator Comes to the iPhone
For $9.99, XPlane offers a realistic flight simulator experience for the iPhone. Released last week, and developed in only a month, the app takes full advantage of the accelerometer of the iPhone to create a truly accurate flying experience.