Detroit Metropolitan Wayne County Airport — Detroit, United States

Detroit Metropolitan Wayne County Airport, commonly identified by its code DTW, serves as one of Delta Air Lines' largest hubs, funneling connecting traffic across the central and eastern United States through its expansive McNamara Terminal. That terminal is famous among frequent flyers for its length and for the underground moving walkway lit by ambient music and colored lighting, a corridor that has become something of a minor pop-culture landmark in American air travel. Located southwest of downtown Detroit near Romulus, the airport replaced smaller facilities that once handled the region's commercial traffic during the automobile industry's mid-century boom years. DTW's six runways support heavy operations even during harsh Midwestern winters, when snow removal crews work continuously to keep the airfield functional. Beyond Delta's dominant presence, the airport also anchors significant air cargo operations tied to the automotive supply chains still centered around greater Detroit.