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San Francisco International Airport (USA)

Located some 21 km toward south of San Francisco City, San Francisco International Airport serves as a major gateway to Asia and Europe. It is the largest airport in Bay area and the second busiest in the state of California after Los Angeles International Airport. It ranks as the 22nd busiest airport in the world in terms of passenger traffic. The airport is a major hub of United Airlines and serves as a major base of Virgin Atlantic. The airport is one of the first airports in the world to have implemented the Fly Quiet Program, a program that analyzes and grades individual carriers on noise level procedures when flying in and out of the airport.
The airport has four passenger terminals and seven concourses designed in a ring formation. Terminal 1 (Southern Terminal) has boarding areas B and C. Terminal 2 (Central Terminal) has boarding area D with 14 gates. The upper floor of the terminal houses the control tower and other offices. Terminal 3 (Northern Terminal) has boarding area E and F and is mainly used by United Airlines for its domestic operations.
The International Terminal was opened in 2000 and effectively replaced the international departures at Terminal 2. The terminal is the largest international terminal in North America and the largest terminal building in the world. Unlike most international airport terminals, this terminal is not only used by international travelers; it is a general use terminal that can be accessed by travelers from the other terminals. All incoming and outgoing international flights are served from this terminal. The terminal also serves domestic flights by JetBlue Airways, Hawaiian Airlines and Sun County Airlines.