The Garage is probably your best shot but you'll need at least 150mm+ to get full frame shots. Not to mention, that spot is only good for 23L and pretty much only in the evening. You can get some shot of aircraft on the ramp for A or D but that's the only other thing to my knowledge. I guess you could get landings on 23R if your lens was big enough!
Ramp shot from garage:
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Photo © Justin Idle
use to have a nice observation area off the side of 23L/5R where you could park your car and watch/photograph planes but post-9/11 is was shut down.