Lethal Skies II:
Unlock New Planes: 
To unlock new planes, complete the objectives listed below: 

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)

SP-1 mission:
Successfully complete mission 4 with an "A" or greater rank.

SP-2 mission:
Successfully complete mission 9.2 with an "A" or greater rank.

Every plane:
In the main menu, push L2(2), Right, R1(3), Left(2), R2(4), Start Every plane in campaign mode and two-player mode will be unlocked. 

All campaign missions:
After using the ALL PLANES code, push Down, R2, R1, Up(2), L1, L2, L1, Start at the main menu. 

All paint schemes:
Press Left, Right, Left, Right(2), Left, Right, Left, L2, R2, Square(3), Start at the main menu. Press Square at the hanger to access the new paint schemes.

All special campaign missions:
After using the ALL PLANES code, push Left, L2(2), L1, Up(3), Down, Start at the main menu. 

All side trax campaign missions:
Enable the "All campaign missions" code, then press L1, R1, R2, R1, Right, Left(2), Up, Start at the main menu. 

Unlimited ammunition and missiles:
Press R1, R1, L2, R2, Left, Right, Left, Right, Up, Down, Up, Down while playing the game, before taking off. 

All dogfight missions:
Press R1(3), L2(3), Up, Right, Down, Left, Up, Start at the main menu.

All trial training missions:
Press Right(2), R1(2), Up, L1(3), Start at the main menu.