The Comac C919 is a narrow-body twinjet airliner developed by Chinese aerospace manufacturer Comac. The development programme was launched in 2008, production of the prototype began in December 2011, it rolled out on 2 November 2015 and the aircraft’s maiden flight was on 5 May 2017. Its first commercial deliveries are expected in 2021 to China Eastern Airlines. The aircraft, primarily constructed with aluminium alloys, is to be powered by either CFM International LEAP or ACAE CJ-1000A turbofan engines, and be able to carry 156 to 168 passengers in a normal operating configuration up to 5,555 km (3000 nmi). It is intended to compete primarily with the Boeing 737 MAX and Airbus A320neo. As of 31 August 2018, Comac has 1008 commitments including 305 firm orders, mostly from Chinese leasing companies or airlines, with the exception of GE.