Southwest Airlines BWI Terminal Operating out of Baltimore/Washington International Thurgood Marshall Airport (BWI), Southwest Airlines BWI Terminal mostly uses Concourses A and B. These terminals are renowned for their roomy, contemporary designs that provide passengers with a convenient and comfortable experience. Travel essentials retail stores and fast eats and sit-down restaurants are among the dining and shopping options available to passengers. The terminals include easy access to the gates, plenty of seating, and charging outlets. Southwest prioritizes customer service and efficiency, which is evident in the expedited check-in and boarding procedures at BWI.