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The inaugural flight of PSA's (Pacific Southwest Airlines) Lockheed L-1011 TriStar was on August 1, 1974 from San Diego to San Francisco via Los Angeles. Their first L-1011, registration number N10112, was nicknamed ‘Mother Grinningbird’. Did you ever fly on a Lockheed L-1011 TriStar? #SFOHistory Pacific Southwest Airlines (PSA), L-1011 inaugural flight certificate 1974 SFO Museum Collection Gift of the William Hough Collection 2006.010.706 This image was posted on August 22, 2016.