What Terminal is United Airlines At BOS? The main base of operations for United Airlines is Boston Logan International Airport's Terminal B (BOS). This airport is well furnished with contemporary conveniences, such as stores, restaurants, and cozy seating sections. Travelers can enjoy hassle-free travel thanks to reduced security procedures and effective check-in counters. For qualified passengers, Terminal B also offers convenient access to United Club lounges, which provide a calm and comfortable environment. United Airlines guarantees a seamless travel experience for travelers arriving at or departing from Boston Logan Airport thanks to its handy location and amenities.