The airport is Delta Air Lines' second-largest hub in terms of total operations. Detroit serves as the primary gateway to Asia for the Eastern United States for Delta and is also the third-busiest gateway to Europe for the airline. The airport is a major gateway for tourism in metropolitan Detroit and is one of SkyTeam's major Midwestern hubs. It is also the fourth-largest base for Spirit Airlines and is a major connecting point between the Eastern and the Western United States. The airport has service to 30 international destinations and service to 39 states across the United States. Operated by the Wayne County Airport Authority, the airport has four main runways, two crosswind runways, two terminals (McNamara Terminal and North Terminal), and 129 in-service gates. McNamara Terminal has three concourses (A, B, and C), while North Terminal has one (D). Concourse A in McNamara Terminal, at nearly 1 mi (1.6 km) in length, is the second-longest airport concourse in the world (the longest is in Terminal 1 of Japan's Kansai International Airport). An on-site Westin Hotel and conference center is connected to Concourse A. Detroit Metropolitan Airport has maintenance facilities capable of servicing and repairing aircraft as large as the Boeing 747-400.
In 2016, Detroit Metropolitan Wayne County Airport was the 18th-busiest airport in the United States. In terms of aircraft operations (takeoffs and landings), the airport was 18th-busiest in 2013. Metro Airport primarily serves the Metropolitan Detroit area, Toledo, Ohio area, approximately 40 miles (64 km) south of the airport, the Greater Ann Arbor, Michigan area, which is west of the airport, and the city of Windsor, Ontario and Southwestern Ontario in nearby Canada. The airport serves over 140 destinations and was named the best large U.S. airport in customer satisfaction by J.D. Power & Associates in 2010.