US Airways is in the Star Alliance, the largest of the groupings. Fellow U.S.-based Star members United Airlines and Continental Airlines merged in 2010, and US Airways has continued to feed its partners with its strong East Coast network. If US Airways were to merge with AMR, it would be open to joining Oneworld, some people said. That would help restore American Airlines' eroded East Coast network by bringing in US Airways' routes to small East Coast markets and its connecting hubs in Philadelphia and Charlotte, N.C.