San Francisco International Airport is a major international airport located 13 miles south of downtown San Francisco, California, United States, near the cities of Millbrae and San Bruno in unincorporated San Mateo County. It is often referred to as SFO. The airport has flights to points throughout North America and is a major gateway to Europe and Asia. It is the largest airport in the San Francisco Bay Area and the second busiest airport in California after Los Angeles International Airport. In 2009 San Francisco International Airport was the tenth busiest in the United States and the twentieth largest airport in the world, by passenger count. It is the fifth largest hub of United Airlines.
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