US Airways Dividend Miles (Pre-FlightFund Merger) - A330-300 on Domestic Route

US Airways (Washington) will deploy the new Airbus A330-300 on the first US domestic route on December 18 when it enters scheduled service on the Philadelphia - Miami route. The return Miami - Philadelphia flight (US2) will continue on to Rome (FCO).
http://www.airlinersonline.com/news-sunday.html

Looking at the schedule, it seems to show a "change of gauge", with the MIA-PHL leg using a 737.