Bisbee Douglas International Airport — Douglas Bisbee, United States

DUG is the IATA code for Bisbee Douglas International Airport, serving the twin border communities of Douglas and Bisbee in southeastern Arizona, close to the Mexican border. Despite the grand name, DUG is a small general aviation field with no scheduled commercial airline service; its runways historically supported military pilot training during World War II as Douglas Army Airfield before transitioning to civilian use. Today it primarily handles private aircraft, agricultural flights, and occasional charter traffic supporting the mining and ranching economy of Cochise County. The desert border location makes it useful for border patrol and customs-related aviation activity as well, and its long runway heritage from military days still exceeds what its light traffic volume would otherwise require.