Sized between the Boeing 767-300ER and the Boeing 777-200, the 767-400ER features a lengthened fuselage; aerodynamic improvements, including additional wing span; increased takeoff weight capability; and an all-new main landing gear. It is designed to be the most efficient airplane in its size category, making it an ideal replacement for aging L-1011, DC-10-30 and A300 airplanes.