Frontier Airlines BOSTON Terminal is home to Frontier Airlines, a well-known low-cost airline in the US (BOS). This guide gives you all the information you need to have a hassle-free and happy travel experience by providing detailed information about Frontier Airlines' operations at BOS. Serving millions of travelers each year, Boston Logan International Airport (BOS) is among the busiest airports in the country. BOS has four passenger terminals: A, B, C, and E. It is renowned for its effectiveness and contemporary amenities. The main base of operations for Frontier Airlines is Terminal C, which is furnished with a variety of amenities and services to improve traveler experience.