The McDonnell Douglas MD-11 is a wide-body aircraft manufactured by McDonnell Douglas and equipped with three engines. Its design is derived from the DC-10 aircraft and features a single engine on the tail. But its fuselage and wingspan are longer than the DC-10, and wings have been added to each end, while the design of the wing section has been improved. The MD-11 offers a new engine for buyers to choose from, USES more composite materials, and fully digitized cockpit equipment. After the mD-11 was discontinued in 2001, many mD-11 aircraft were used for cargo services, and retired MD-11 aircraft were all converted into cargo planes. VTOL ??for flaps, trim for trim.