The L-1011 TriStar's sales were hampered by two years of delays due to developmental and financial problems at Rolls-Royce, the sole manufacturer of the aircraft's engines. Between 1968 and 1984, Lockheed manufactured a total of 250 TriStars, assembled at the Lockheed plant located at the Palmdale Regional Airport in southern California north of Los Angeles. After production ended, Lockheed withdrew from the commercial aircraft business due to its below-target sales. As of 2020, the L-1011 is the last non-Russian wide-body airliner to enter production that was not manufactured by the Airbus and Boeing duopoly or their predecessor companies.