Operating out of Baltimore/Washington International Thurgood Marshall Airport (BWI)’s Terminal A is Southwest Airlines. Southwest Airlines BWI Terminal Check-in counters, self-service kiosks, and customer service desks are among the passenger services available in Terminal A, which is exclusively designated for Southwest. The terminal has comfortable seating areas, a variety of culinary options, and retail establishments to make your trip even more enjoyable. The faster security lanes are open to TSA PreCheck users. For Southwest travelers, Terminal A guarantees a smooth experience by streamlining the check-in, security, and boarding procedures.