The world's biggest plane - the only one of its kind - has landed in Perth, Australia. CNN affiliate Seven Network reports. Source: Seven Network The wide body aircraft 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. The world's biggest plane - the only one of its kind - has landed in Perth, Australia. CNN affiliate Seven Network reports. Source: Seven Network