Delta Air Lines operates exclusively from Terminal A at Logan International Airport in Boston. This terminal comprises a main building with gates A1-A11 and a satellite terminal with gates A13-A22, connected via an underground pedestrian tunnel. Terminal A features two Delta Sky Club lounges one in the main terminal and another in the satellite terminal providing travelers with comfortable spaces to relax before their flights. Designed with environmental sustainability in mind, Terminal A was the first airport terminal in the U.S. to receive LEED certification for its eco-friendly design, which includes heat-reflecting roofs, low-flow faucets, waterless urinals, self-dimming lights, and stormwater filtration systems.