As for in-terminal photo spots, one of the great places I watched from was the end of the middle concourse at O'Hare. Aircraft taxi right in front of you. There also used to be a fenced-in observation deck on the top of AA's terminal. The end of Terminal 1 at LAX (SW, US, etc) would also be good I would think.
Tom in NO (at MSY)
P.S. The end of our recently renovated concourse C (TW, AA, UA) at MSY isn't bad!!!
"The criminal ineptitude makes you furious"-Bruce Springsteen, after seeing firsthand the damage from Hurricane Katrina