- Boston Logan International Airport's Terminal B is home to the Spirit Airlines BOS Terminal. It is committed to providing dependable and reasonably priced service to all Spirit Airlines passengers. Essential facilities including food selections, hygienic restrooms, and roomy seats are available inside. Travelers can easily locate check-in desks and gates thanks to the terminal's excellent organization. To make your trip less stressful, it's usually a good idea to arrive early. From here, Spirit Airlines offers easy and effective low-cost travel.