Airbus had held discussions with McDonnell Douglas to jointly produce the aircraft, which would have been designated as the "AM 300". This aeroplane would have combined the wing of the A330 with the fuselage of the McDonnell Douglas MD-11. However, talks were terminated as McDonnell Douglas insisted on the continuation of its trijet heritage. Although from the start it was intended that the A340 would be powered by four CFM56-5 turbofan engines, each capable of , Airbus had also considered developing the aircraft as a trijet due to the limited power of engines available at the time, namely the Rolls-Royce RB211-535 and Pratt & Whitney JT10D-232 (redesignated PW2000 in December 1980).