Delta Air Lines operates primarily out of Terminal A at Boston Logan International Airport for domestic flights, with gates in both the main terminal and a satellite concourse connected by an underground tunnel

. Additionally, Delta uses Terminal E for international flights, where there is also a Delta Sky Club lounge for international departures

. In summary:

• Domestic Delta flights: Terminal A (main terminal and satellite concourse)
• International Delta flights: Terminal E

Delta provides shuttle bus service between Terminal A and Terminal E for passenger convenience