USAPA, or someone else representing the US Airways pilots, will have to be involved with the SLI. If they don't, who is going to sit down in front of the arbitrators and say "this is what we want" when the APA says "this is what we want". It's actually ludicrous to say the APA will represent US Airways pilots in a SLI with American pilots. (Granted, third listers and West pilots will only get marginally better representation with USAPA than APA...the West Pilots might even argue worse.) But, the fact remains...you can't have an arbitrator if there isn't two parties to arbitrate.