Airlines and Aircraft Serving Billings Effective April 15, 1975
FRONTIER AIRLINES
Aircraft Operated:
Boeing 737-200, Convair 580, DeHavilland Twin Otter
Destinations Served:
Bozeman, Casper, Great Falls, Jackson (WY), Lewsiton (MT), Miles City, Salt Lake City, Worland

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

WESTERN AIR LINES
Aircraft Operated:
Boeing 737-200
Destinations Served:
Casper, Denver, Great Falls, Sheridan
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