Mountain West Airlines-Idaho (IATA: FX) was a short-lived commuter airline based in Boise, Idaho. Its first flight was on January 29, 1979 with its flights continuing until the service termination on March 5, 1981. Its last published timetable was February 14, 1981. It operated Embraer EMB 110 Bandeirantes and occasionally a Piper PA-31 Navajo for freight runs. Cities served at various times were: Boise, Pocatello; Twin Falls, Idaho; Idaho Falls; Sun Valley, Idaho; Lewiston, Idaho and Coeur d'Alene, Idaho; Reno, Nevada; Salt Lake City, Utah; Rock Springs, Wyoming and Butte, Montana.