As a long time NW / DL FF and having moved over to AA 2.5 years ago I can tell you that there are some things AA does better (the 8 SWUs are a real nice benefit) and some things DL does better. I've moved away from being loyal to any one airline because none of them care about your loyalty. I take the best combination of fare and convenience I can find these days. The big wild card for anyone considering a switch is what AA's FF program will look like when the dust settles next year. My guess is that it will look more like DL's but that's just one persons WAG...
