I guess a toss up. Both would be good for US Airways. As for me as a pilot?
Delta: Lots of overlap, synergies=fuloughs.
American: Over a thousand pilots on furlough already & American talking about laying off and additional 15,000 employees during the bankruptcy process. The American pilots no doubt will try and put furloughed pilots ahead of active, judging by their past behavior.
What gives APA the right to do something like that? Something exactly like the East has attempted (and continues to attempt) to do to the West Pilots? AA would NEVER do that...would they?