OVER G FIGHTERS UNLOCKABLES
F/A-18 Hornet
Finish sub-mission 7 in Area 2 to unlock the F/A-18 Hornet in Scenario mode.
F-117A
Finish tactical mission 1 in Area 4 to unlock the F-117A for in Scenario mode.
F-15
To get Premium Reward 6, Unlock the other planes of your five wingmen. Then get the "Best Guy" or "Predator" rank in multi-player mode. When this is done, go to Challenge mode and select "Arena". Shoot down enough planes so you get the rank "Top Gun". After you get that rank, land and save. Go to Big Boss mode and the 305th Squadron. The F-15 should be available.
F-15C Eagle
Finish sub-mission 5 in Area 4 to unlock the F-15C Eagle in Scenario mode.
F-15E
Finish tactical mission 1 in Area 6 to unlock the F-15E in Scenario mode.
F-15J
Finish tactical mission 1 in Area 3.
F-16AM
Finish sub-mission 6 in Area 5 to unlock the F-16AM in Scenario mode.
F-16C
Finish sub-mission 4 in Area 2 to unlock the F-16C in Scenario mode.
F-18E
Finish sub-mission 7 in Area 3
F-2 Blue Impulse
Finish sub-mission 9 in Area 3.