"Chickenhawk", for a chopper pilot, is the most awesome read.
"The Big Show" by Pierre Closterman is the definitive WW2 fighter pilot account.
Surprised no one has mentioned "F4 Phantom" by Robert Presst (not sure I've spelled him right).
As a youth I read a book called "Stuka Pilot" by Heinz Ulrich Rudel, one legged german ace for whom Hitler invented a special Iron Cross, who destroyed 1000 russian tanks in his Ju 87 and who also sank a russian battleship. He was an unrepentant nazi and I suspect his autobiography is now politically unacceptable and so long out of print. Made fascinating reading though.
CM