San Francisco International Airport has four terminals - the International Terminal, Terminal 1, Terminal 2, and Terminal 3. The three domestic terminals - 1, 2, and 3 - are laid out in a partial ring, with the domestic parking garage in its middle. The International Terminal completes the ring, with its dedicated parking placed in front of it, outside the ring. Presently, Terminal 2 is undergoing renovation.
The terminals are linked together by the AirTrain internal transit system, operating 24 hours per day. It is also possible for passengers to walk between terminals. Each terminal serves several airlines and a large number of destinations. Each terminal is well served by restaurants, bars, newsstands, shops, and ATMs (cash machines). Business services and banking services are available in the airport. Airline club lounges cater to the needs of frequent flyers.
San Francisco Airport's International Terminal serves many airlines, including Aeroflot, Air China, Air France, Air New Zealand, Alaska Airlines (Mexico), All Nippon Airways, Asiana, British Airways, Cathay Pacific, EVA Air, Japan Airlines, KLM Royal Dutch Airlines, Korean Air, LACSA, Lufthansa, Mexicana, Northwest (international), Philippine Airlines, Singapore Airlines, TACA, United Airlines (international), and Virgin Atlantic.
The International Terminal has two sets of gates: A1-A12 and G91-G102. The terminal has two AirTrain stations, located at opposite ends of the main hall, at one level above ticketing.
San Francisco Airport's Terminal 1 serves Air Canada, Alaska Airlines (domestic / Canada), America West Airlines, ATA Airlines, Continental Airlines, Delta Air Lines, Frontier Airlines, Hawaiian Airlines, Midwest Airlines, Northwest (domestic), and US Airways.
Terminal 1 has three sets of gates: Rotunda A contains gates 1-17, boarding area B contains gates 20-36, and boarding area C contains gates 40-48. The terminal has one AirTrain station, which is located on level 5 of the domestic parking garage. A tunnel, elevators, and escalators connect it with the boarding areas.
San Francisco Airport's Terminal 3 serves American Airlines, Ted, and United Airlines (domestic).
Terminal 3 has two sets of gates: boarding area E contains gates 60-67 and boarding area F contains gates 68-90. The Terminal 3 AirTrain station is on level 5 of the parking garage. A bridge ("skybridge") links the station with mezzanine-level 3 of the terminal proper.