Spirit Airlines Boston Logan Airport Terminalis well-known for its economical and uncomplicated flight travel, which draws in travelers on a tight budget. For Spirit travelers, Terminal B provides a contemporary, efficient experience that is shared with other large airlines. The instant you walk into the terminal, you're welcomed by roomy check-in sections, self-service kiosks, and friendly employees who are always willing to help. Regardless of your level of experience flying with Spirit, the terminal offers a user-friendly atmosphere that makes finding what you need simple.