sentences:  Lockheed announced that they were going to approach Japan and the government-owned Air Canada to develop a two-engined version of the L-1011 as a way of filling both the "YX" needs as well as for domestic flights within Canada.The "BiStar" was shorter, had new wings and tail, and was powered by two upgraded RB-211-X engines, which Lockheed was already developing for the extended-range L-1011-2.Douglas, recently purchased by McDonnell, had also been pitching a two-engine version of the DC-10, which combined the body of the -10 with the wings of the -30, along with the upgraded CF6-50 engine.