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Happy 90th Birthday United Airlines! Walter T. Varney, a flight school and air taxi operator from San Francisco, launched his mail service on April 6, 1926. His company, Varney Air Lines, was acquired by United Aircraft and Transport Corporation in 1930. United is the longest serving airline at San Francisco International Airport. On December 1932, Pacific Air Transport, a subsidiary of United Airlines, signed the first major contract with SFO. Leon D. Cuddleback, chief pilot for Varney Air Lines c. 1926 SFO Museum Collection Gift of United Airlines Archives 1999.047.184 This image was posted on April 06, 2016.