Principal differences between the VC-25A and the standard Boeing 747, other than the number of passengers carried, are the electronic and communications equipment aboard Air Force One, its interior configuration and furnishings, self-contained baggage loader, front and aft air-stairs, and the capability for in-flight refueling. These aircraft are flown by the presidential aircrew, maintained by the presidential maintenance branch, and are assigned to Air Mobility Command's 89th Airlift Wing, Andrews Air Force Base, Md.