Boston Logan International Airport has four passenger terminals, A, B, C, and E, and the total of 102 gate positions. The Terminal A replaced a building of the period of the 1970s that was designed by Minoru Yamasaki, which was once occupied by the now-defunct Eastern Air Lines. It was opened on 16 March 2005. The airport is made of 2 buildings: the Main Terminal and a Satellite Terminal and consists of 21 boarding gates.

The Main Terminal involves the two levels: Level 1 and Level 2. Level 2 is the Departures level. This level gives the access to boarding gates A1 to A11 and to Satellite Concourse S2 with gates from A13 to A22. They are connected by an underground path.

There is also a walkway in the ground level that links the parking garage, Hilton Hotel, Terminal E and its parking lots.

Terminal B includes a couple of buildings: the North and South buildings. They are located on its first and second levels. Terminal B consists of 2 levels; they are Level 1 and Level 2. On the Level 2 is located at the Departures and Check-in level. This level is also divided into the North and South sides. The North Side level 2 is considered to be the home of some airline counters, such as Virgin American and American Airlines Admirals Club. There is access to the boarding gates B37, B38, B30-38 and B29-21 and also Security check is placed in its core. As for the South Side, it is the home of Air Canada, PenAir and Spirit airlines with the access to boarding gates B4-B14, B1-B3, and B15-B29. And here too, the Security Check is situated in its core.

At the Boston Logan International Airport, there is located the terminal that has more gates and they are split into gates: C8-C10, C11–C21, C25–C36 and C40–C42. The Terminal C is divided into three levels: Level 1, Level 2 and Level 3. Level 2 is the Departures and Check-in level, where the check-in facilities are situated. In this level, each airline has its own check-in, such as JetBlue, Capa Air, Sun Country, Virgin America and Alaska Airlines. Moreover, from Boston Logan Airport, Delta Airlines have flights to Detroit (DTW) Airport.

The last one is Terminal E and it is the International Terminal at the airport. All international flights from and to Boston Logan International Airport depart from here. In addition, every flight of US origin is hosted in this terminal. Apart from that, most non-U.S. carriers except Aer Lingus, Air Canada, Porter Airlines, TAP Air Portugal, and WestJet depart from Terminal E. It host over 12 gates, they are E1-E12. The gates E10-E12 were added as a part of the terminal modernization to accommodate the Airbus A380. The Terminal E’s building is divided into three different levels. These levels include Level 1, Level 2 and Level 3. The Level 2 is aimed for Departures and US Customs and Border Protection uses them. On the second level are located the gates E1a, E1b, and E2. On the Level 3, there are Departures and Check-in areas. There are located the gates from E4 to E10.

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