The Maverick is on your left(past a hangar) as you enter the airport tarmac gates beside the terminal building.
It starts a tourist photo taking sub-mission(...can't remember da name).
If it ain't there leave & come back on foot,uh,you know the drill.
To get the 'copter without having to cancel the sub-mission...
push it away from it's spawn point with a heavy vehicle,but careful...
it won't handle much damage b4 exploding.
There is at least one other spawn point(...but,dah I forget where).
The only Sabre spawn I remeber is in a driveway in Little Havanna as mentioned.
Drive more slowly to allow it to spawn.