Pacific Southwest Airlines (short PSA) was a former airline from the United States. The airline started business in 1949 with leased DC-3s. After the main competitor AirCal merged with American in 1986, PSA could not stay independent anymore, and had to accept ther merger with USAir, which happened in 1987. The last flight labeled PSA did take place in 1988.

See also: PSA Flight 182

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