The courts have held the majority can't do that simply to advance one group over another but legally USAPA is just adopting another proposal in an ongoing an uncompleted contract negotiation. However, there is legal precedent for changing seniority list as I stated above. It involved retroactively changing the seniority list so less tenured employees would be laid off first. The court found that using longevity wasn't advancing one group over another because the same criteria was being applied to everyone and it was within the wide latitude for union members with less time to be laid off first. That is the funny thing about longevity, it just isn't a pluck out of they sky, it is the basis for almost every labor union as it became the objective measurable replacement to meritocracy.
When USAPA became the legal signatory, you may as well just insert their name where it says ALPA. Until there is a contract it is a "proposal". Just as any other proposal being negotiated in the course or reaching a joint contract, it can be retracted, renegotiated, and passed numerous times as long as the conditions and restrictions meet the criteria within the Transition Agreement. Even those can be changed through negotiation between USAPA and US Airways and through membership ratification. USAPA has already negotiated a change to the West contract and had it voted on and approved by all MIGS, East and West. Funny that US Airways let East pilots vote on the west contract. Oh, that right, East or West, all members, agency fee payers, or objectors to USAPA, the only collective bargaining agent, lawfully elected through the NMB process. That is the law and obviously US Airways understands that or they wouldn't have allowed USAPA to alter the West contract.
The 9th articulated these points within the majority opinion. There were no review of the merits of the trial, because the lack of jurisdiction negated the fact the trial ever took place. It begs the question why several of the key arguments were commented on by the majority. What Nicalou is(Seniority proposal arrived through internal union process), what USAPA responsibility is("Good Faith"), and citation of the preeminent SCOTUS case where DFR and "Good Faith" obligations were defined. If you were to ask one of your mighty ALPA lawyers in private, they would tell you the majority was commenting and clarifying some legal standards and how the 9th Circuit views them if a similar cases should find itself in front of another circuit judge. Clearly the intended audience wasn't USAPA. USAPA from what I gather always held that it was an ALPA created "proposal", consequently the same argument Jeff Freund(America West Merger Counsel) argued in D.C. federal district court. USAPA has always said it intends to bargain in "Good Faith", a defense it tried to present in district court, but a definition arrived out of a SCOTUS trial, that the District judge wouldn't instruct the jury on. Lo and behold, in their published opinion, which is now 9th circuit precedent, they make sure the definition and precedent is included. You can ignore these things and it won't cost you a penny, but the Addington plaintiffs you obviously go to bat for have paid a pretty penny, or have a pretty bill that is still running. One they are funding on both sides but keep on giving them poor legal advice. You are probably helping USAPA by encouraging them to waste money and senselessly beat their heads against a wall. If the 9th had to review USAPA's other 4 complaints in the appeal, venture to guess based on the District judges handling of ripeness, how they would have been ruled on? If I were a betting man, I wouldn't be taking a bet on the side of plaintiffs. It was clear that the judge in the District Court made rulings from ripeness, evidence, to the argument defense could make to manufacture a result. I would be leery of anyone hanging their hat on anything out that trial.