Planespotting is way cool. Good to see that I'm not the only kid at heart who enjoys watching the planes come and go.

I don't know much about US airports, but here's a couple of other ones you might like. I'm sure others will have more suggestions.

Toronto (YYZ): Go to the roof of the parkade in Terminal 1. Take the elevator to level 8, walk up the stairs to level 9. You can go right up to the edge of the parkade and look down and see the apron areas of T1 and T2. T3 and some of the runways are visible. Caution: It can be very windy up there.

Amsterdam (AMS): Check out the panorama terrace. It's an outdoor rooftop viewing area and you can see a lot. It's a really big viewing area and was just recently renovated. One of my favorite airports.

Cheers,
FewMiles..