- Detroit Metropolitan Airport's North Terminal is where Spirit Airlines is based (DTW). In addition to culinary options, retail stores, and cozy seating areas, the Spirit Airlines DTW Terminal offers a number of passenger amenities. Spirit Airlines is a low-cost airline that provides both domestic and international flights. The design of the terminal makes it simple for travelers to get to their gates, and the check-in, security, and boarding procedures go smoothly. For Spirit Airlines travelers, DTW's North Terminal offers a quick and easy travel experience.