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This year San Francisco International Airport is turning 90! From a humble, single dirt runway to bustling terminals serving over 50 million passengers annually, SFO has become an international gateway and one of the busiest airports in the country. Stay tuned for more SFO history as we celebrate this historic milestone! Image: Mills Field Municipal Airport of San Francisco, Hangar No. 1, 1927. SFO Museum Collection. 2011.032.0011 This image was posted on April 27, 2017.