Coordinates: Usually found in hangars, or on the runway
Details: Creating heat while in a helicopter helps them to spawn.
G9 Eclipse: Jet fighter
Coordinates: 22163 x 23265, 11699 x 5106
Details: Has quad rockets and twin autocannons that fire as fast as mounted guns.
Si-47 Leopard: Jet fighter
Coordinates: 17141 x 12369
Details: has twin rockets, and twin mounted guns.
Large military jet plane
Coordinates: 22163 x 23265
Details: No weapons, just a large transport plane.
Aeroliner 474: large passenger jet
Coordinates: 9748 x 12798
Details: There are several dotted around this very large, open military base. The runway can be accessed at the bottom right of the airport The defense seems to be pretty weak here, so don't worry that you have to taxi the plane for quite a while
Cassius 192: Private Jet
Coordinates: 29584 x 11435 (Mile High Club)
Details: They also fly above you where you can steal them relatively easily.