Cheat Codes
Enter these codes on the main menu:

Unlock all planes in campaign mode and 2-player mode	L2, L2, RIGHT, R1, R1, R1, LEFT, LEFT, R2, R2, R2, R2, START.
Unlock all missions in campaign mode	DOWN, R2, R1, UP, UP, L1, L2, L1, START. (Must enter the unlock all planes code first.)
Unlock all special missions in campaign mode	LEFT, L2, L2, L1, UP, UP, UP, DOWN, START. (Must enter the unlock all planes code first.)
Unlock all side trax missions in campaign mode	L1, R1, R2, R1, RIGHT, LEFT, LEFT, UP, START. (Must enter the unlock all missions code first.)
Unlock all missions in dogfight mode	R1, R1, R1, L2, L2, L2, UP, RIGHT, DOWN, LEFT, UP, START.
Unlock time trial mission in training mode	RIGHT, RIGHT, R1, R1, UP, L1, L1, L1, START.
Unlock extra paint schemes	LEFT, RIGHT, LEFT, RIGHT, RIGHT, LEFT, RIGHT, LEFT, L2, R2, SQUARE, SQUARE, SQUARE, START.

Unlock New Planes
To unlock new planes, complete the objectives [listed below in table]:

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)

Lethal Skies II (PS2) hints
# Infinite ammunition

Before takeoff during a game, press R1, R2, L2, R2, Left, Right, Left, Right, Up, Down, Up, Down.

# F-14

Successfully complete mission 1.

# A-10

Successfully complete mission 2.

# JAS-39

Successfully complete mission 3.

# AV8B

Successfully complete mission 4.

# F-15E

Successfully complete mission 5.

# EF2000

Successfully complete mission 6.2.

# YF-23

Successfully complete mission SP1 with an "S" rank.

# F/A 18

Successfully complete mission 7.

# F5Z

Successfully complete mission 8 with an "S" rank.

# SU-27

Successfully complete mission 9.2.

# F-22

Successfully complete mission 10.

# SU-35

Successfully complete SP2 with an "S" rank.

# S-37

Successfully complete mission 11.

# F-25

Successfully complete mission 15 with an "S" rank.

# F-35

Successfully complete mission 15 with an "S" rank.

# S-47

Successfully complete mission 16 with an "A" 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.

Unlimited ammo
During Gameplay before you takeoff press the following code: R1, R1, L2, R2, Left, Right, Left, Right, Up, Down, Up, Down