Although runway length may be of some academic interest, in terms of usability for airline operations, a runway of at least 6,000 ft (1,829 m) in length is usually adequate for aircraft weights below approximately 200,000 lb (90,718 kg). Large aircraft, primarily the Wide-body aircraft: Airbus A310, A330, A340, A350, A380; Boeing 747, 767, 777, 787; McDonnell Douglas DC-10, MD-11; Ilyushin Il-86, Il-96; and the Lockheed L1011, will usually require at least 8,000 ft (2,438 m) at sea level and somewhat more at higher elevation airports.