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What Terminal is United Airlines At BOS? United Airlines operates out of Terminal B at Boston Logan International Airport (BOS). Terminal B is one of the key terminals at BOS, serving numerous domestic and international flights. United Airlines passengers can enjoy a range of amenities within Terminal B, including dining options, retail stores, and comfortable waiting areas. The terminal is designed for efficient check-in and security processes, ensuring a smooth travel experience for all passengers flying with United Airlines from Boston Logan Airport.