Try these ones
A-12 Avenger 2
Hold L2 and quickly press Square, L1, Square, R1, Triangle, Square at the Hangar.
FB-22 Strike Raptor
Hold L2 and quickly press R1, Square, R1, Square, R1, Triangle at the Hangar.
F-18 HARV
Hold L2 and quickly press L1, Triangle, L1, Triangle, L1, Square at the Hangar.