Cheat mode:
     Enter one of the following codes at the main menu to activate the
corresponding effect. Note: Enabling a code will not allow the game to
save your progress.

Cheat menu:
     Press Y, L, D-pad Left, R, D-pad Right, White at the main menu.

Japanese planes:
     Press   White,   Black,   L,  R,  Right  Analog-stick  Up,  Right
Analog-stick Left at the main menu.

All planes and missions:
     Press  Right  Analog-stick  Up,  Right  Analog-stick Down, White,
Black,  Right  Analog-stick Left, Right Analog-stick Right at the main
menu.

Upgrade planes:
     Press  L,  Right  Analog-stick Left, R, Right Analog-stick Right,
White, Y at the main menu.