Current State of USAPA
I am not taking sides here, but Silver did rule that USAPA won it's case against the Nic, but DFR suits will likely follow. Binding arbitration apparently only bound East and West to the pervious merger language that will never be completed.
That said, USAPA is not signing an ISL protocol agreement that does not preserve the current USAPA membership committee and associated union leadership. MCB implies that each certified collective bargaining agent will be represented and USAPA is in no hurry.
USAPA is also filing for an extension with the NMB for SCS. No SCS without a protocol agreement.