airport during the 1950s and early 1960s. The original Frontier Airlines was serving Billings in 1950 with Douglas DC-3 aircraft operated on routes to Denver and Salt Lake City. By 1962, Frontier had introduced Convair 340 aircraft on its flights into the airport and would later serve Billings with Boeing 737-200 jets as well as with Convair 580 and de Havilland Canada DHC-6 Twin Otter turboprops. Improvements over the years include runway lights in 1935 to the new air traffic control tower in 2005. Major terminal expansions were made in 1958, 1972, and 1992. In early 2006 the airport added electronic monitors giving info on arrivals and departures. The name changed from the Billings Municipal Airport to Billings Logan Field in 1957, after Dick Logan, the airport manager, died. In 1971 the airport became Billings Logan International Airport. By 1961, Northwest Airlines was operating Lockheed L-188 Electra propjet service into the airport on a routing of New York Idlewild Airport (IDL, now JFK Airport) - Detroit (DTW) - Milwaukee (MKE) - Minneapolis/St. Paul (MSP) - Bismarck, ND (BIS) - Billings (BIL) - Great Falls (GTF) - Spokane (GEG) - Yakima (YKM) - Seattle (SEA). The jet age arrived in Billings by 1966 when Northwest introduced Boeing 727-100 "Fan Jet" flights in addition to its Electra turboprop service. In 1968, Northwest was operating nonstop 727 jet service from the airport to Chicago O'Hare International Airport, Minneapolis/St. Paul, Great Falls and Spokane as well as direct, no change of plane 727 flights to New York LaGuardia Airport, Newark, Washington, D.C. National Airport, Detroit, Cleveland, Milwaukee, Seattle and Portland, OR. Western Airlines was serving Billings in 1966 with Lockheed L-188 Electra turboprops with an example routing being Los Angeles (LAX) - San Diego (SAN) - Phoenix (PHX) - Denver (DEN) - Cheyenne (CYS) - Casper (CPR) - Sheridan (SHR) - Billings (BIL). Western was also operating direct Electra propjet service to Calgary (YYC) via a stop in Great Falls (GTF) during the late 1960s. By the early 1970s, Western was operating all of its flights into the airport with Boeing 737-200 jetliners. In 1979, Western was operating nonstop Boeing 727-200 service to both Minneapolis/St. Paul and Seattle as well as flying nonstop Boeing 737-200 service to Denver, Great Falls and Salt Lake City. For at least part of each year from the late 1970s to early 1980s, Billings was served by wide body