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United Airlines operates primarily out of Terminal 3 and the International Terminal (G gates) at San Francisco International Airport (SFO), which serves as one of the airline's major hubs. Terminal 3 is modern and well-equipped, offering a range of amenities including comfortable lounges, dining options, and streamlined check-in and security processes. For international flights, United uses the International Terminal, where passengers can enjoy duty-free shopping and spacious waiting areas. The terminals are connected by the AirTrain, making transfers between domestic and international flights convenient. United’s strong presence at SFO ensures efficient operations and a wide selection of domestic and international routes.