This info seems a little different , suggesting 2 pieces - no?

The following passengers are exempt** from the first and second checked bag fee, but not any applicable weight fees:

* All Dividend Miles Preferred members (Silver, Gold, Platinum and Chairman’s Preferred)
* Passengers traveling to and from Europe, or to and from Asia
* Star Alliance Silver and Gold status members
* Unaccompanied minors (with US Airways unaccompanied minor paid assistance)
* Confirmed First Class and Envoy passengers at time of check-in
* Active U.S. military personnel with ID (first through third bag up to 100 lbs/45 kg each free of charge)