It all boils down to this: do you, or don’t you, want to wear a hat for the rest of your career....?

All joking aside... Great choice to have. Both companies will give you a great career. Contracts come & go... today’s winner could be tomorrow’s loser. You won’t know for sure until you retire.

Since you will be commuting from a city where neither airline has a base, my suggestion is to go with the first class date.

Yes, your seniority will go much further here at AA...but I also have to say that Delta has a much better company culture and better management/labor relations (at least, today... who knows 5, 10 years from now?)

Good luck and congrats!