That's not how it's going to work... There won't be any language in the Endeavor LOA regarding scope. The LOA will just be a flow up/down between Endeavor and Delta. Delta is saying that will satisfy the original LOA 9 agreement and continue flying the 35 RJ's.

The reason it might be voided down the line is if DALPA argues any flow up/down must have involved them, and a arbitrator agrees and voids it. I don't understand how that could happen, since DALPA doesn't have a say in whom Delta or Endeavor hires, or have a say in contracts between Delta and Endeavor (after all, no Delta pilot would be forced to flow down to Endeavor it's voluntary, per LOA 9).

I feel like it is more likely that the argument will be the flow doesn't satisfy LOA 9 to continue operating the 35 RJs. If the arbitratior decides that is true that will put a stop to those 35 RJs flying plus awarding damages. Or, the arbitratior sides with Delta and continues flying the 35 RJs.