The following planes are unlocked when you complete the corresponding mission:
F-14: Beat Mission 1
A-10: Beat Mission 2
JAS-39: Beat Mission 3
AV8B: Beat Mission 4
F-15E: Beat Mission 5
EF2000: Beat Mission 6.2
F/A 18: Beat Mission 7
F5Z: Beat Mission 8 (S Rank)
SU27: Beat Mission 9.2
F-22: Beat Mission 10
S-37: Beat Mission 11
F-25, F-35: Beat Mission 15 (S Rank)
S-47: Beat Mission 16 (S Rank)
YF-23: Beat Mission SP1 (S Rank)
SU-37: Beat Mission SP2 (S Rank)