All aircraft/missions/paint jobs - At the menu immediately following the choose pilot.

Code Effect - Press & Hold (-) & (+), then press (D-Pad) left, right, 1, 2(x2), 1 A text message will appear at the top of the screen; "All aircraft and campaigns are unlocked". Also, all paint jobs including "Air Marshall".

Unlockables - Additonal Flyable Aircraft and Upgraded Weapons

Unlocking the two mini campaigns (Dogfight & Bombing) is accomplished by beating the main campaign mode. Each mini campaign contains six missions. Once all six are complete, two more aircraft (per mini campaign) are unlocked. In addition, the weapons of the aircraft can be upgraded by completing the two mini campaigns.

Unlockable How to Unlock

B-25 Mitchell & Hs-129 Complete the Bombing Mini Campaign
Me-262 Schwalbe (Sparrow) & Me-163 Komet Complete the Dogfight Mini Campaign
Upgraded bombs, rockets, & torpedos for all aircraft Complete the Bombing Mini Campaign
Upgraded cannons & machine guns for all fighters Complete the Dogfight Mini Campaign

Flyable Airplanes - Completing the campaign missions with certain rankings unlocks new aircraft after each mission. Simply beating the mission unlocks the first of the two aircraft, while a Veteran Pilot ranking is required to attain the second. The rankings are given with stars, with the maximum number being five and the minimum being one. Three stars are required for a Veteran Pilot ranking.

Unlockable How to Unlock

B-17 Flying Fortress & Spitfire IX Complete Campaign Mission 18 - Counter Attack with at least a Veteran Pilot Ranking

Beaufighter & P-40C Warhawk Complete Campaign Mission 6 - Desert Rats with at least a Veteran Pilot Ranking
Boulton-Paul Defiant & Ki-43 Hayabusa (Oscar) Complete Campaign Mission 10 - Midway: Turning Point with at least a Veteran Pilot Ranking

De Havilland (DH) Mosquito & N1K Shiden (George) Complete Campaign Mission 13 - Rabaul Raid with at least a Veteran Pilot Ranking
Devastator & D3A1 Val Complete Campaign Mission 7 - Day of Infamy with at least a Veteran Pilot Ranking
Dornier Do-335 Pfeil (Arrow) Complete Campaign Mode

F2A Buffalo & B5N2 Kate Complete Campaign Mission 8 - Surprise Attack with at least a Veteran Pilot Ranking
Fw-190A & Me-109G Complete Campaign Mission 14 - Preemptive Strike with at least a Veteran Pilot Ranking

Hurricane I & Me-110C Complete Campaign Mission 1 - Training Day with at least a Veteran Pilot Ranking
Hurricane II & Me-110E Complete Campaign Mission 5 - Desert Recon with at least a Veteran Pilot Ranking

Meteor & Kikka Complete Campaign Mission 20 - Berlin 1945 with at least a Veteran Pilot Ranking

P-51D Mustang & Me-109K Complete Campaign Mission 16 - D-Day Normandy with at least a Veteran Pilot Ranking
P-51H Mustang & Fw-190D-9 Complete Campaign Mission 19 - Flying Fortresses with at least a Veteran Pilot Ranking
P-82 Twin Mustang & J2M Raiden (Jack) Complete Campaign Mission 12 - The Battle of New Georgia with at least a Veteran Pilot Ranking

SB2C Helldiver & SB2A Buccaneer Complete Campaign Mission 11 - Holding Guadalcanal with at least a Veteran Pilot Ranking
SBD-3 Dauntless & A6M Zero Complete Campaign Mission 9 - Midway: Opening with at least a Veteran Pilot Ranking
Seafire & Ju-87 Stuka Complete Campaign Mission 4 - London 1940 with at least a Veteran Pilot Ranking
Spitfire I & Me-109E Complete Campaign Mission 2 - Skies of Dunkirk with at least a Veteran Pilot Ranking
Swordfish & Spitfire V Complete Campaign Mission 3 - Dunkirk Evacuation with at least a Veteran Pilot Ranking

Tempest & A-1 Skyraider Complete Campaign Mission 17 - Paris: La Liberation with at least a Veteran Pilot Ranking
Typhoon & Me-110G Complete Campaign Mission 15 - Top Secret with at least a Veteran Pilot Ranking