Unlockable Aircrafts
X-02- the X-02 will appear after you've collected all available aircrafts(except the FALKEN)

The FALKEN will appear in the hangar once you've collected all objects hidden in special warehouses. These warehouses are in Missions 12A, 12B, 16A, 16B, and 27.

12A- Follow the river north, go east at the fork(opposite of where mission targets are)[md]you must get close for it to show up on radar.
12B- Past four radar sites, near the smokestacks (NE)[md] you must destroy certain ground targets for it to show up on radar.
16A- Between field HQ and the airfield
16B- West of the river, between the airfield and oil refinery (at south of river)
27A- very close to the gun tower in front of the tunnel. Labeled HANGER in container.

X-02 SP color unlocks after clearing HARD. FALKEN SP color unlocks after clearing EXPERT.