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#OnThisDay in 1927, the Mills Field Municipal Airport of San Francisco began operations. The first graded airstrip was 4,950 feet long and surfaced in rolled rock fill covered with two inches of earth. In its first full month of operation, the airport registered nineteen airplane landings and nineteen passengers. Today, SFO has more than 1,200 aircraft arriving and departing everyday on runways between 7,650 and 11,870 feet in length. #SFOHistory Mills Field Municipal Airport of San Francisco, aerial 1928 SFO Museum Collection 2011.032.0077 This image was posted on June 07, 2016.