The Lockheed L-1011 TriStar, commonly referred to as just L-1011 (pronounced "ell-ten-eleven") or TriStar, is a medium-to-long range, three-engine, widebody passenger jet airliner. It was the third widebody airliner to enter commercial operations, following the Boeing 747 and the McDonnell Douglas DC-10. Between 1968 and 1984, Lockheed manufactured a total of 250 TriStars. After production ended, Lockheed withdrew from the commercial aircraft business due to its below-target sales.