San Francisco International Airport
San Francisco International Airport 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 and on the Western Coast of North America, 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.
SFO's AirTrain is the airport's landside people-mover system. Fully automated and free of charge, it connects all four terminals, the two international terminal garages, the BART station, and the airport's Rental Car Center.
Largest Airlines at SFO include: United Airlines, Alaska Airlines, Delta Air Lines, Southwest Airlines , American Airlines, among others.