Challenger Airlines and successor Frontier Airlines served at Casper from the late 1940s until 1986. In 1950, Frontier was serving the airport with Douglas DC-3 aircraft and by the early 1960s the airline had introduced larger Convair 340 and Convair 580 propliners. By 1970, Frontier began replacing their Convair 580 turboprop flights with Boeing 737-200 jet service primarily to its Denver (DEN) hub as well as to Billings, Bozeman, and Missoula, Montana and Jackson and Riverton, Wyoming. All Frontier service ended when the airline shut down on August 24, 1986.