Airlines and Aircraft Serving Billings Effective November 15, 1979
BIG SKY AIRLINES
Aircraft Operated:
     Cessna, Handley Page Jetstream
Destinations Served:
     Butte (MT), Casper (WY), Great Falls (MT), Helena (MT)

FRONTIER AIRLINES

Aircraft Operated:
    
Boeing 737-200, DeHavilland Canada DHC-6 Twin Otter
Destinations Served:
     Bozeman (MT), Denver (CO), Glasgow (MT), Great Falls (MT), Helena (MT), Lewiston (MT), Miles City (MT)

NORTHWEST ORIENT AIRLINES

Aircraft Operated:
    
Boeing 727-200, McDonnell Douglas DC-10
Destinations Served:
     Bismarck (ND), Bozeman (MT), Chicago O'Hare (IL), Great Falls (MT), Helena (MT), Minneapolis/Saint Paul (MN)

WESTERN AIRLINES

Aircraft Operated:
    
Boeing 727-200, Boeing 737-200
Destinations Served:
     Denver (CO), Great Falls (MT), Minneapolis/Saint Paul (MN), Salt Lake City (UT), Seattle/Tacoma (WA)
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