 In addition, Amtrak's "Empire Builder" train runs through the north of the state, stopping in Libby, Whitefish, West Glacier, Essex, East Glacier Park, Browning, Cut Bank, Shelby, Havre, Malta, Glasgow, and Wolf Point.Bozeman Yellowstone International Airport is the busiest airport in the state of Montana, surpassing Billings Logan International Airport in the spring of 2013.Montana's other major airports include Missoula International Airport, Great Falls International Airport, Glacier Park International Airport, Helena Regional Airport, Bert Mooney Airport and Yellowstone Airport.