PHILADELPHIA – The final US Airways flight has landed in Philadelphia, completing the last leg of its roundtrip journey. The Airbus A321 landed at Philadelphia International Airport at 5:54 a.m. Saturday after departing from San Francisco at 1:07 a.m. as a red-eye flight. The plane is Flight 1939, named for the airline’s founding year. The flight departed from Philadelphia at 10:36 a.m.