| Billings (BIL) |
| Alaska Airlines (AS) | Allegiant Air Llc (G4) | Delta Air Lines (DL) |
| Frontier Airlines Inc. (F9) | Northwest Airlines (NW) | United Airlines (UA) |
| Denver Intl Apt (DEN) | Helena (HLN) | Las Vegas McCarran International Apt (LAS) |
| Minneapolis International Apt (MSP) | Salt Lake City (SLC) | Seattle/Tacoma International Apt (SEA) |