I put this list together during a fit of boredom. Nowhere near many of you, I'm sure, but since I've travelled only on leisure trips and grew up in a modest home, I'd say it's not bad.

Currently Flying:
Northwest
Continental
Delta
ANA
American
U.S. Air
KLM
LOT

Gone to that great retirement desert in the sky:
CP Air
Eastern Airlines
Piedmont
TWA
Pan Am

Total: 13