Airports
MSP Minneapolis 20 12.0 %
DEN Denver 14 8.4 %
OKC Oklahoma City 14 8.4 %
DCA Washington 13 7.8 %

Airplanes
Airbus 320 10 12.0 %
CRJ 700 9 10.8 %
Airbus 319 6 7.2 %
McDonnell Douglas-80 5 6.0 %
CRJ 3 3.6 %

Like FriendlySkies, this list is from about the past 5 years--when I really kept track of such things. But I'm still young, and my list may pale compared to some others here, but I'll catch up!

Also, just out of curiosity, for duration of the flight, what do you put? The time between scheduled departure and arrival, or the actual time spent on the plane (i.e. taking delays into account)?

Thanks!