Unlock Blue Impulse F-86 Fighter
Go to the Island map and get the Blue Impulse Logo in Free Flight Mode.

Get F-105 Drone
Get a altitude of 50,000 feet during Training Mode.

Get the A-10
Finish all ground training objectives during training mode.

Get F-104J
Get to mach 2.0

Get F-86 Fighter
Log one hour of flight time in Training Mode.

Get F-14 test bed
Beat Recon Mission 2.

Get F-15 #1
Get 50 Kills.

Get F-15 #2
Get 100 Kills.

Get F-15 C
Finish ACM objectives in Aero Meet.

Get F-15 J
Finish 10 Scrambles.

Get Oh-6
Finish Helicopter Training.

Get Su-27 Fighter
Beat recon Mission 3.

Get F-2B
Finish 50 Scrambles.

Get Blue Impule T-4
In the monument level, use a helo and find the rock pillar that has a hole in the top of it. This can be done by lightly holding the Square button and circling until the view centers on it. Then go into it and fly through the icon.