Airlines and Aircraft Serving Billings Effective April 1, 1981
BIG SKY AIRLINES
Aircraft Operated:
Cessna, Handley Page Jetstream, Swearingen Metroliner
Destinations Served:
Casper, Glasgow, Glendive, Helena, Lewistown, Miles City, Sheridan, Sidney

FRONTIER AIRLINES
Aircraft Operated:
Boeing 737-200
Destinations Served:
Denver, Great Falls, Helena, Missoula

NORTHWEST ORIENT AIRLINES
Aircraft Operated:
Boeing 727-100, Boeing 727-200
Destinations Served:
Bismarck, Bozeman, Chicago O'Hare, Great Falls, Helena, Minneapolis/Saint Paul

WESTERN AIRLINES
Aircraft Operated:
Boeing 727-200
Destinations Served:
Denver, Salt Lake City
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