^^^ try working under APA... you'll change your mind within 2-3 months max.
If you are coming from an ALPA regional, you have no idea how much better - and different - ALPA legacy is. It is night & day different.
In house unions are ineffective at legacy airlines. ALPA is the best bet. Any arguments, take a look at how DL and UA pilots are doing compared to AA.
Edit: that was for Adios, not 450kt!