RMI REGION AIRPORTS/CARRIERS Montana Billings (BIL) DL, OO, GQ, NW, QX, UA Bozeman (BZN) DL, OO, NW, QX, UA* Butte (BTM) OO, QX Kalispell (FCA) DL, GQ, NW, OO, QX Glasgow (GGW) GQ Glendive (GDV) G GQ Great Falls (GTF) DL, GQ, NW, OO, QX Havre (HVR) GQ Helena (HLN) DL, OO, GQ, NW, QX Lewiston (LWT) GQ Missoula (MSO) DL, OO, GQ, NW, QX, UA* Sidney (SDY) GQ West Yellowstone (WYS) OO (summer only) Wolf Point (OLF) GQ South Dakota Aberdeen (ABR) NW/XJ Huron (HON) UA*, ZK Pierre (PIR) NW/XJ, UA*, ZK Rapid City (RAP) DL, F9, NW, KL, UA* Sioux Falls (FSD) NW, UA, UA*, XJ Watertown (ATY) NW/XJ Brookings (BKX) UA* Yankton (YKN) UA*, ZK Wyoming Casper (CPR) OO, F9/ZK, UA/ZK Cheyenne (CYS) F9/ZK, UA/ZK Cody (COD) DL, F9/ZK, UA/ZK Gillette (GIL) F9/ZK, UA/ZK Jackson (JAC) A A, CO, DL, OO, NW, UA, UA* Laramie (LAR) F9/ZK, UA/ZK Riverton (RIW) F9/ZK, UA/ZK Rock Springs (RKS) F9/ZK, UA/ZK Sheridan (SHR) F9/ZK, UA/ZK Worland (WRL) F9/ZK, UA/ZK Idaho Boise (BOI) AA, DL, F9, GQ, HP, NW, QX, UA, WN Idaho Falls (IDA) GQ, QX, OO Lewiston (LWS) QX Moscow-Pullman (PUW) QX Pocatello (PIH) QX, OO Sun Valley (SUN) QX, OO Twin Falls QX, OO GATEWAY AIRPORTS/CARRIERS Denver (DEN) AA, AC, AS, B6, BA, CO, DL, F9, GQ, FL, HP, LH, MX, NK, NW, QX, TZ, UA, UA*, US, YV, YX, ZK Minneapolis/St. Paul (MSP) AA, AC, CO, DL, OO, F9, FI, FL, HP, K8, KL, NW, OH, TZ, UA, UA*, US, XJ Salt Lake City (SLC) 5A, AA, AM, B6, CO, DL, OO, F9, HP, HP*, NW, UA, UA*, WN Spokane (GEG) AC, AS, DL, GQ, HP, QX, NW, WN, UA, UA* Portland (PDX) AC, AS, CO, DL, F9, HA, LH, QX, SY, UA, UA*, WN

Airline Carriers (listed alphabetically by symbol) 5A Alpine Aviation AA American Airlines AC Air Canada AM AeroMexico AS Alaska Air B6 Jet Blue BA British Airways CO Continental CO* Continental Express DL Delta Airlines F9 Frontier Airlines FI Iceland Air FL AirTran GQ Big Sky Airlines HA Hawaiian HP America West HP* America West Express K8 Skyway KE Korean Air KL KLM LH Lufthansa MP Martinair MW Midway Airlines MX Mexicana NJ Vanguard NK Spirit Airlines NW Northwest Airlines OH Comair OO Skywest QQ Reno Air QX Horizon SY Sun Country TW TWA TZ America Trans Air UA United Airlines UA* United Express US USAir WN Southwest XJ Mesaba YV Mesa Airlines YX Midwest Express ZK Great Lakes