Pause game play, then hold LT and quickly press X, Y, Y, X. Then hold RT and quickly press Y, X, X, Y. Repeat the code to disable its effect.
Increased damage by weapons:
Pause game play, then hold LT and quickly press LB, LB, RB. Then hold RT and quickly press RB, RB, LB. Repeat the code to disable its effect.
All campaign missions and planes:
Hold LT + RT and quickly press X, LB, RB, Y, Y, RB, LB, X at the main menu.
Complete the following achievements to unlock the indicated number of Xbox Live Gamerscore points (1,000 total possible points).
The Ace of Aces (175 points): Get the highest score in all campaign missions.
Survivor (150 points): Outlive your enemies in Arcade mode.
Ace Killer (150 points): Defeat all the other aces.
Veteran (150 points): Complete the game.
Hero (150 points): Earn all medals.
Colonel (100 points): Reach the rank of Colonel.
Collector (125 points): Unlocked and collect all the planes.