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. Interest had been tepid when the idea was first floated, but with Lockheed's and Airbus' aggressive moves they once again brought the idea forward. Boeing was coy on the topic of a smaller 747, but suggested they were instead looking at an entirely new design, a "long thin" aircraft similar to an enlarged twin-engine 707. In the end, Japan Air Lines' YX needs were filled with 747-100SR, for "short range", which added passenger capacity at the cost of range. Boeing's "long, thin" design would emerge as the Boeing 757 - it was the only one of the proposed twins to actually ship.