San Francisco International Airport (IATA: SFO, ICAO: KSFO, FAA LID: SFO) is an international airport 13 miles (21 km) south of downtown San Francisco, California, United States, near Millbrae and San Bruno in unincorporated San Mateo County. It has flights to points throughout North America and is a major gateway to Europe and Asia.
SFO is the largest airport in Northern California and the second busiest in California, after Los Angeles International Airport. In 2017, it was the seventh-busiest airport in the United States and the 24th-busiest in the world by passenger count. It is the fifth-largest hub for United Airlines and functions as United's primary transpacific gateway. It also serves as a secondary hub for Alaska Airlines. It is a major maintenance hub for United Airlines, and houses the Louis A. Turpen Aviation Museum and Library.
The airport is owned and policed by the City and County of San Francisco, despite it being located in San Mateo County. Between 1999 and 2004, the San Francisco Airport Commission operated city-owned SFO Enterprises, Inc., to oversee its business purchases and operations of ventures.
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