Unlock Ace Mode
If you want a challenge then beat Hard mode to unlock Ace mode.


Unlock Special Parts
When you get the required S-rank using specific original planes it is possible to unlock the following special parts for them.

Apalis
Unlock Earth Shaker (Cockpit) $34,200:
Get an S-rank mission 03A with Apalis.

X-02
Unlock Long Range MSSL (Weapon) $45,100:
Get an S-rank mission 13A with X-02.

Forneus
Unlock Diffusion Coat (Armor) $49,600:
Get an S-rank mission 09A with Forneus.

Fregata
Unlock Hydra Engine (Engine) $51,600:
Get an S-rank mission 02 with Fregata.

Cariburn
Unlock Sylph Wing (Wing) $55,600:
Get an S-rank mission 01 with Cariburn.

Falken
Unlock Laser Extender (Weapon) $69,800:
Get an S-rank mission 10A with Falken.

XFA-27
Unlock Scarface MBS (Weapon) $76,500:
Get an S-rank mission 04B with XFA-27.

Complete the following tasks to unlock the corresponding medals.

Unlock Bronze Ace:
Destroy 200 Enemies

Unlock Silver Ace:
Destroy 500 Enemies

Unlock Gold Ace:
Destroy 1000 Enemies

Unlock Freedom Tower:
Liberate Griswall

Unlock Eye of the Storm:
Defeat the Gleipnir

Unlock Mark of the Vioarr:
Defeat the Fefnir

Unlock Marksman:
Destroy 5 Aircraft with Guns

Unlock Sharpshooter:
Destroy 15 Aircraft with Guns

Unlock Expert Marksman:
Destroy 50 Aircraft with Guns

Unlock Sea Guardian:
At Terminus Island keep damage to the Allied fleet to a minimum

Unlock Land Guardian:
At Stand Canyon keep Allied casualties to a minimum

Stage complete is cumulative over ALL difficulities for SP stage requirement.

Unlock ADF-01 Falken:
Complete SP stage

Unlock Stage 03B 'Captive City':
Complete mission 05 or 06 before going to 04

Unlock Stage 07C 'Time Limit':
Complete mission 07 then 09 then 11 then 07C

Unlock Stage 12C 'Wild Card':
Complete mission 07 then 08 then 10 then 09 then 12C

Unlock SP Stage 'Operation X':
Complete ALL missions and mission branches