Boston’s Logan International Airport (BOS) Terminal A is home to Southwest Airlines BOS Terminal Boston Logan, one of the busiest airports in the US, is a major hub for Southwest, which operates a number of domestic and a few international flights out of this terminal. Check-in desks, self-service kiosks, baggage claim, and ticketing services are all part of Southwest’s operations at BOS, and they are all intended to give customers a quick and easy journey.