Just for kicks and giggles, here's the list ranked by total (not just O&D). I cut the list off at the 10 million line. And again, Boston would be a little higher with Providence and Manchester, and (apparently) Tampa with whatever PIE is.
Code:
New York 51,883,694
Atlanta 43,008,154
Chicago 39,281,585
LA Area 38,092,034
Miami 31,262,044
Dallas/Ft.Worth 31,149,065
DC Area 29,917,661
SF Area 26,179,300
Denver 24,337,554
Houston 23,606,848
Las Vegas 20,224,090
Phoenix 18,968,897
Orlando 18,211,975
Charlotte 17,215,648
Minneapolis 16,173,119
Detroit 15,715,346
Philadelphia 14,878,298
Seattle 14,787,443
Boston 12,068,312