Just wanted to add

Not sure if that was because of the Apple refunds for the in-app purchase that dont work/install or a glitch. Anyways just wanted to add:
Humorously, the British planes & pilots are the weakest. USA, second worst. Now playing as the French which make the other two look like children. The German are the most powerful on any level. Guessing the developer, not 2K which is likely merely a distributor or licensor, is of a European country. Thus the high learning curve even on the easiest level. Also you tend to replay the same missions over & over (in app purchase doesnt work as I found out & iTunes refunded); and the new planes (2) in the game are either slow, weak & maneuverable or fast, strong & low in maneuverability. Also issues with crashing, most likely previous complaints are based on the IOS. I have to restore all my iPads, iPods every few months or the Apps start crashing. An issue that has plagued Apple since the second generation of iPod Touch.

Oz893 about Sid Meier's Ace Patrol