US Airways is offering a a double elite qualifying and redeemable miles promotion for select markets through the end of the year. Those markets are PIT, RDU, BOS, and MSP.
Unlike the similar Delta and American promotions that require travel to originate in the targeted city offering double elite qualifying miles, the US Airways offer includes travel to those cities as well.
Registration is required separately for each fo the double elite qualifying offers.
STL and RIC included too.
Also SAN, I updated RIC, SAN, STL link in my blog