If you don't have one you can get a US Airways World Mastercard from Barclaycard.
Current offer: 40,000 miles after first purchase w/ $89 annual fee (not waved).
1st checked bag free on all US Airways ticketed flights
"Priority Zone 2 boarding"
1 free AA lounge pass
All your US Airways miles become AAdvantage miles when the plans merge next year.
The problems with this perks.
1) Zone 2 boarding is worthless when half the plane is ranked higher.
This happened on all my flights last week.
2) The lounge I went to was meh at best.
Clean, Quiet, but nothing great. Little food, no free beer but Bud, and seating that was just OK.
This is what I get for going to the LAS Centurion Lounge first.
The other problem:
While Barclaycard is OK in most ways. The website is clean, easy to navigate, but how it shows charges just plain sucks.American Airlines Announces New Combined AAdvantage Program