Spirit Airlines operates from Boston Logan International Airport (BOS) Terminal B (also referred to as Terminal C on some maps). Travelers can check in at Spirit Airlines counters or kiosks at this airport. Check-in gates for Spirit flights are located in Terminal B. There are amenities such as restaurants and shops nearby. Be sure to check airport operations in advance for connecting flights and arrange transfers within the airports accordingly if necessary. It is recommended that you verify terminal information through Boston Logan’s official website or mobile application closest to your travel date for any additional information. https://airportsterminalguides.....com/spirit-airlines