I've said this many times. You will most likely enjoy a more stable, more rewarding career at a ULCC or LCC such as Spirit or jetBlue.
JetBlue's growth last year was around 10% IIRC. AA was flat. In one of the best economic markets for airlines in DECADES.
I think Delta is a good bet. Their management is excellent and has a multi-decade long history of making sound conservative decisions.
Neither United nor AA have good management. They are riding the wave of low fuel prices.
Money won't make you happy beyond a certain point.