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. The aircraft's sales were hampered by two years of delays due to developmental and financial problems at Rolls-Royce plc, the sole manufacturer of the TriStar's engines. After production ended, Lockheed withdrew from the commercial aircraft business due to its below-target sales.