United Airlines will launch daily nonstop service between its San Francisco International (SFO) hub and Reagan Washington National Airport (DCA) on May 14. It will be United’s first flight from Reagan National to San Francisco but its 13th between Washington DC and the City by the Bay. All other flights use Dulles International (IAD).United will initially operate the new service with Boeing 737-700 aircraft, with a total of 124 seats—12 in first and 112 in economy.