Successfully complete these missions to unlock bonus aircrafts:

Blue Impulse 10	Blue Impulse T-4
Blue Impulse 15	T-2
Blue Impulse 20	F-86F
Sky Mission Attack 1	F-4EJ
Sky Mission Attack 2	F-1
Sky Mission Attack 3	F-15DJ
Sky Mission Attack 4	Gray F-4EJ
Sky Mission Attack 5	F-2 (F-16)
Sky Mission Attack 8	Dolphin