Aero Wings

I love it, specially becuase it is the first free game that I got in which you have more levels to go. I am still in the level 5 of the Aero Wings.

To move your plane up or down, just tilt your ipod up or down.
You will have the machine gun, the basic weapon which will fire forward.Two types of missile one that goes forward and other that goes in the target. The missiles and health you will get destroying the enemy planes.

It seems that the free game has 6 levels and the paid one has 50.