In the indicated difficulty setting and campaign complete the following missions to unlock the corresponding plane in the game. Japanese planes cannot be used in Campaign or Mission mode until Campaign mode has been completed at least once.

Unlock Yak 3:
Complete Coral Sea campaign in Ace difficulty setting.

Unlock P-51A Mustang:
Complete Gilbert Islands campaign in Ace difficulty setting.

Unlock Tempest Mk. II:
Complete Guadacanal campaign in Ace difficulty setting.

Unlock P215-01 Top Secret:
Complete Iwo Jima campaign in Ace difficulty setting.

Unlock P-61A Black Widow:
Complete Marinaras campaign in Ace difficulty setting.

Unlock Fw-190A-8:
Complete Marshall Islands in Ace difficulty setting.

Unlock P-47D Thunderbolt:
Complete Midway campaign in Ace difficulty setting.

Unlock P-80 Shooting Star:
Complete Philippines campaign in Ace difficulty setting.

Unlock Sea Fire Mk.III:
Complete Wake Island in Ace difficulty setting.

Unlock PBY-5 Catalina:
Complete Coral Sea - Scratch One Flat Top in any difficulty setting.

Unlock SBD-2 Dauntless and A6M2-N Rufe:
Complete Coral Sea - Torpedo Practice.

Unlock B6N1 Jill:
Complete Gilbert Islands - Million Men in any difficulty setting.

Unlock Ki-102A Randy:
Complete Gilbert Islands - Recon in any difficulty setting.

Unlock B-26B Marauder and Ki-61-1A Tony:
Complete Guadalcanal - Strike in any difficulty setting.

Unlock H8K Emily
Complete Guadalcanal - Tokyo Express in any difficulty setting.

Unlock B-25G Mitchell
Complete Iwo Jima - Kamikazes in any difficulty setting.

Unlock F8F Bearcat
Complete Iwo Jima - Landing in any difficulty setting.

Unlock J7W Shinden:
Complete Iwo Jima - Raise the Flag in any difficulty setting.

Unlock Ki-84-1A Frank:
Complete Marianas - Revenge in any difficulty setting.

Unlock F6F-3 Hellcat:
Complete Marianas - Usurper in any difficulty setting.

Unlock TBD-1 Devastator and J7M2 Jack.
Complete Marshall Islands - Rescue Pilots in any difficulty setting.

Unlock TBF-1 Avenger:
Complete Midway - Defend Midway in any difficulty setting.

Unlock P-38D Lightning
Complete Midway - Mikuma in any difficulty setting.

Unlock A6M2 Zero and B5M1Kate:
Complete Pearl Harbor - Surprise Attack in any difficulty setting.

Unlock D4Y2 Judy:
Complete Philippines - Samar Sea in any difficulty setting.

Unlock Me262:
Complete Philippines - Steal Prototype in any difficulty setting.

Unlock F4F-3 Wildcat and F1M Pete
Complete Wake - Combat Air Patrol in any difficulty setting.

Unlock F4U-1 Corsair and D3A1 Val:
Complete Wake - Evacuate Admiral in any difficulty setting.

Unlock G4M2 Betty:
Complete Wake - Wake Up in any difficulty setting.

In any difficulty setting complete the following missions to unlock the corresponding 'Historical' mission.

Unlock Historical Mission 1:
Complete Wake - Evacuate the Admiral.

Unlock Historical Mission 2:
Complete Midway - Battle of Midway.

Unlock Historical Mission 3:
Complete Guadalcanal - Backs Against the Wall.

Unlock Historical Mission 4:
Complete Gilbert Islands - Million Men.

Unlock Historical Mission 5:
Complete Marianas - Revenge.

Enter the following codes at the Main menu to unlock the corresponding effect. Entering these codes will disable Auto-Save and prevent you from saving your progress.

Unlock Cheat Menu:
L1, R2, L2, R3, R1, L3

Unlock Planes and Missions:
Right Analogue stick up, Right Analogue Stick Down, Right Analogue Stick Left, R2, L1, Right Analogue Stick Right

Unlock Japanese Planes:
Circle, R2, L1, L2, D-pad Left, D-pad Up

Upgrade Planes:
L1, Right Analogue Stick Left, R2, Right Analogue Stick Right, D-pad Right, D-pad Down