Howdy,
I have a choice - and could fly UA. I feel that AA gets me through security a bit faster (a few more airports with elite checkin).
Get's me on my plane faster more often when it matters (so I don't worry about overhead space).
And most of all, I earn more than enough miles to fly my family in F on 2-3 vacations a year - while at the same time having the ability to upgrade myself whenever I want.
I'm a fan.
Keep the faith,
Pakse