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According to wikipedia Antonov An-225 Mriya ) is a strategic airlift cargo aircraft that was designed by the Antonov Design Bureau in the Ukrainian SSR within the Soviet Union during the 1980s. It is powered by six turbofan engines and is the heaviest aircraft ever built, with a maximum takeoff weight of 640 tonnes (710 short tons; 630 long tons). It also has the largest wingspan of any aircraft in operational service.
Specifications:
Crew: 6
Length: 84 m (275 ft 7 in)
Wingspan: 88.4 m (290 ft 0 in)
Height: 18.1 m (59 ft 5 in)
Wing area: 905 m2 (9,740 sq ft)
Aspect ratio: 8.6
Empty weight: 285,000 kg (628,317 lb)
Max takeoff weight: 640,000 kg (1,410,958 lb)
Fuel capacity: more than 300,000 kg (661,000 lb)[54]
Cargo hold – volume 1,300 m3 (46,000 cu ft), 43.35 m (142.2 ft) long × 6.4 m (21 ft) wide × 4.4 m (14 ft) tall
Powerplant: 6 × Progress D-18T turbofans, 229.5 kN (51,600 lbf) thrust each
Performance
Maximum speed: 850 km/h (530 mph, 460 kn)
Cruise speed: 800 km/h (500 mph, 430 kn)
Range: 15,400 km (9,600 mi, 8,300 nmi) with maximum fuel; range with 200 tonnes payload: 4,000 km (2,500 mi)
Service ceiling: 11,000 m (36,000 ft)
Wing loading: 662.9 kg/m2 (135.8 lb/sq ft)