We are waiting decision from a federal judge that should put the whole East (old US Air)/ West (America West) seniority debacle to rest. The company went to court a year ago to ask whether they (the company) were liable for damages should they not use the Nicolau Award as the seniority list of record.
Recall that the company did accept the list from ALPA, just before ALPA was voted off the property by the East pilots who wrongly blamed the union and not their own negotiators for failing to listen to the arbitrator's admonishments that "date of hire would not be a factor in the resulting seniority list". So the only seniority list that is in play on the US Airways side is the Nicolau arbitrated list.
The APA has acknowledged in its communications with it's members that any new seniortity integration involving the American pilots will be done under the Bond-McCaskille federal legislation that mandates binding arbitration and prevents the "staple job" that APA used on the TWA pilots. That legislation was put in precisely because of the AA/TWA merger.
The expected seniority list integration (if the deal goes through - and that is a BIG if) will go on the lines of Delta/NWA which will involve certain equipment fences and a ratio of active pilots by seat and equipment groups. All sides know of the mess that has taken place here. No one wants to repeat it, least of all Doug Parker, the US Airways CEO and the driver of this deal.