Yes the case is different but the findings apply.You couldn't be more wrong reading that case and how it compares to the present situation. You might want to go back and look why the case was brought against ALPA and the fact that the circumstances at present have played out 180 degrees opposite of what transpired then.
"That the system ALPA has created places a good deal of power in the hand of arbitrators is not a sign of "unfairness" in the limited sense relevant to evaluating claims of breach of the duty of fair representation, especially since the alternative would be to encourage continuing and acrimonious disputes among workers by opening seniority to continual revision. It is not in the interest of organized labor to incite workers to fight among themselves over job rights. Nor is it in the workers' own interest, behind the veil of ignorance, that is, before they know whether they have been the winner or loser of the arbitration. Here as elsewhere finality serves important social purposes and we certainly cannot pronounce ALPA unfair for giving the arbitrators' determination of seniority as much finality as it has done."
and
"We need not decide whether, if the plaintiffs and their allies ever succeed in ousting ALPA in favor of a union not pledged to defend the arbitrators' award, the matter of seniority can be reopened in collective bargaining negotiations with the airline, or otherwise revisited. The plaintiffs say the award became a provision of the collective bargaining agreement and expired when that agreement expired. We leave aside the merit of this contention beyond noting that an attempt by a majority of the employees in a collective bargaining unit to gang up against a minority of employees in the fashion apparently envisaged by the plaintiffs could itself be thought a violation of the duty of fair representation by the union that the majority used as its tool. Alvey v. General Electric Co., 622 F.2d 1279, 1289-90 (7th Cir. 1980)."