In 2006, Xian began efforts to develop China’s first heavy strategic airlift transport. Development resulted in a four-engined high-wing design featuring a T-tail. The four engines are variants of the WS-10 high bypass ratio turbofans. The Y-20, as it is designated, payload and max takeoff weight are 65 tonnes and 220 tonnes. It offers a similar range as comparable strategic airlifters (4,500km), and is designed to allow for paratrooper operations. The first prototype took flight in early 2013. Testing was ongoing, but the PLAAF already planed to acquire a fleet of at least 400 Y-20s.