Lockheed's only jetliner, produced from 1968 until 1984, and the last commercial airliner it ever produced.
The Lockheed L-1011 TriStar was the third widebody airliner ever to enter service (after the boeing-747 and McDonnell Douglas dc-10), first flying in November 1970 and seeing its first commercial flight with Eastern Air Lines in April 1972, as well as being lockheed's first (and, as it turned out, only) jetliner. The L-1011 is a trijet, with one Rolls-Royce RB211 engine under each wing and a third in the tailcone, fed by an "S-duct" in front of the vertical-stabilizer.
The L-1011 was designed to be the most technologically advanced airliner in the world, featuring (among other things) an extremely capable autopilot which could, in theory, fly the plane all the way from gate to gate without needing any human input at all (although, in practice, the crew still maintained a considerable degree of manual control). However, it was hung up by Rolls-Royce's financial troubles, which forced Lockheed to wait much longer than they had anticipated for the RB211 engine to become available; usually, this would not have been a major problem, as an airplane manufacturer could simply switch to a different engine if their original selection encountered unanticipated delays, but Lockheed designed the L-1011 to take the RB211, and only the RB211. The ensuing delays nearly bankrupted Lockheed, and ensured that the L-1011 would lose out to the less-advanced, but on-time, DC-10. Only 250 TriStars were ever built, and, when the production line was shut down in 1984, Lockheed bowed out of the airliner market altogether; the L-1011 TriStar was the last commercial airliner Lockheed ever produced.
For more information, see the L-1011 TriStar's Wikipedia page.
