OTS civilian new hire here. I had an offer with FX and AA. I picked AA and deleted all my other apps. I didn't want to fly at night, commute to Memphis, or risk being replaced by Amazon and drones. AA has the best bases and fastest movement. I have 34yrs of flying ahead... Management and contracts will come and go many times in that time. DL may be the best right now, but they won't be forever!
AA is a good gig. Don't forget all the thousands of RJ drivers out there that would kill to be here. Be grateful!