Cheats for Air Combat for PSX

When the bird logo is displayed before the "Now Loading" screen, press R1 + 
Circle. If you entered the code correctly, a black screen with the phrase "Now 
Loading" and bouncing CDs in the background will apear and will mean cheat 
mode is active. Now enter one of the following codes. Each time a code is 
successfully entered, a small Namco character will appear in the lower left 
corner. 

999,999,000 credits

Press Down, Circle, Triangle(3), Circle, Triangle, Circle, Triangle, Circle + 
Triangle, then press and hold Circle + Triangle again at the bouncing CD screen. 
Start a game and enter the fighter selection screen. The maximum amount of 
credits will available. 

Change plane's color

Press Up, Down, Left, Right, Up, Down, Left, Right, then hold R1 at the bouncing 
CD screen. For two player mode, replace the controller actions with Left, Right, 
Left, Right, Down, Up, Down, Up, Circle(2), Triangle(2), then press and hold 
Triangle again. 

Change wingman plane's color

Press R1 + Start(10). 

Bonus mini-game

Press Up, Left, Down, Right and start a game. Then, return to the title screen and 
a mini-game lasting approximately six seconds will begin while the main game 
loads again. The Ace Combat icon can be controlled with Left or L2, and Circle or 
R2. Press R1 to switch between three control options. The object of the game is 
to destroy as many of the ships and missiles as possible before the small bird 
walks from the left to right side of the screen.

Pause the game, press L1 or R1 and then continue the game. Now the Japanese text on the right side of the screen will disappear.

Beat the game under the easy difficulty level. Then, after the credits have completed scrolling once the final boss is defeated, the phrase "Extra 10" will appear on the top right corner of the title screen after it reappears. Use the plane select option to access the extra planes.