I will say this though. I congratulate the US pilot for refusing the AA pilot the seat. After all the US pilots have gone thru tremendous heartbreaks over that past mergers, while the AA pilots have tried to stick it to the man, over and over again, from their past mergers. This very well could be a very good tool to use to get both sides closer together and come to a final contract...
That's a pretty vindictive, short sided, and unprofessional perspective.
Politics and personal opinions should never interfere with a jumpseat. This is how we get home to see our families-- not a means to an end. That's a very selfish and self-serving attitude.