A new category of airplane -- the three-engine, dual-aisle widebody -- was added to the world's air transportation system when the DC-10 entered scheduled airline service. The three-engine DC-10 incorporated improvements in propulsion, aerodynamics, structure, avionics, flight control systems and environmental compatibility that advanced industry standards. The DC-10 was built by McDonnell Douglas in Long Beach, California, now the Long Beach Division of Boeing Commercial Airplanes.