Located eight miles northwest of Bozeman, Montana, Bozeman Yellowstone International Airport (BZN) is Montana's busiest airport when measured by passenger service. Also known as Gallatin Field, the airport has a single passenger terminal and three runways. The terminal features a number of paintings, photographs and sculptures depicting the sights of Montana. BZN serves Southwest Montana, including Yellowstone National Park, the cities of Bozeman, Belgrade and Livingston, the Big Sky, Bridger Bowl and Midnight Basin ski resorts, and Montana State University. Alaska Airlines, Allegiant Air, Delta Air Lines, Frontier Airlines and United Airlines all operate flights between BZN and other destinations across the United States.