The long pole in the tent for the SLI is the Nic award. Without a resolution to that, any talks between APA and USAPA are fruitless. I'm sure USAPA knows they can't bully or run-over the APA to accept their DOH list, despite the cheap talk. Probably just going to go to arbitration and let the arbitrators decide which US Air list to integrate into the APA list.
If I were an arbitrator, it'd be easy. Regardless of it's merits or lack thereof, the Nic list has already been decided in binding arbitration by a fellow arbitrator.