The Antonov AN-225 is the biggest airplane in the world. Mriya's wingspan measures 290 feet, that's longer than five semi-truck trailers set end-to-end.The Antonov An-225 Mriya is a strategic airlift cargo aircraft that was designed by the Soviet Union's Antonov Design Bureau in the 1980s. The An-225's name,Mriya means "Dream" in Ukrainian. It is powered by six turbofan engines and is the longest and heaviest airplane ever built with a maximum takeoff weight of 640 tonnes. It also has the largest wingspan of any aircraft in operational service. A second airframe was partially built; its completion was halted because of lack of funding and interest. The Antonov An-225, originally developed specifically to transport the Buran spaceplane , was an enlargement of the successful Antonov An-124 . The airlifter holds the absolute world records for an airlifted single item payload of 189,980 kilograms (418,834 pounds), and an airlifted total payload of 253,820 kilograms (559,577 pounds). It has also transported a payload of 247,000 kilograms (545,000 pounds) on a commercial flight. Generally acknowledged as the largest airplane in the world, the single Antonov An-225 is the world's heaviest aircraft ever (maximum takeoff weight greater than 640 tons) and the largest heavier-than-air aircraft (in length and wingspan) ever entering operational service.