Boston Logan International Airport's Terminal A is home to Frontier Airlines (BOS). This Frontier Airlines BOS Terminal is simple to use and has a number of facilities to provide a comfortable journey. Before your flight, everything you need is available, including dining options and seating areas. Terminal A offers a practical and effective environment for all of your needs, whether you're traveling for business or pleasure. For clear instructions to Frontier's check-in desks and gates, pay attention to the airport signage.