| Afton Municipal (AFO) | Afton | WY | Challis to Afton Municipal |
| Walla Walla Regional (ALW) | Walla Walla | WA | Challis to Walla Walla Regional |
| Austin (ASQ) | Austin | NV | Challis to Austin |
| Battle Mountain (BAM) | Battle Mountain | NV | Challis to Battle Mountain |
| Billings Logan International (BIL) | Billings | MT | Challis to Billings Logan International |
| Baker City Municipal (BKE) | Baker City | OR | Challis to Baker City Municipal |
| Brigham City Regional (BMC) | Brigham City | UT | Challis to Brigham City Regional |
| Burns Municipal (BNO) | Burns | OR | Challis to Burns Municipal |
| Boise Air Terminal Gowen Field (BOI) | Boise | ID | Challis to Boise Air Terminal Gowen Field |
| Miley Memorial Field (Big Piney) (BPI) | Big Piney | WY | Challis to Miley Memorial Field (Big Piney) |
| Kaslo (BR2) | Kaslo | BC | Challis to Kaslo |
| Skypark (BTF) | Bountiful | UT | Challis to Skypark |
| Bert Mooney (BTM) | Butte | MT | Challis to Bert Mooney |
| Johnson County (BYG) | Buffalo | WY | Challis to Johnson County |
| Burley Municipal (BYI) | Burley | ID | Challis to Burley Municipal |
| Bozeman Yellowstone International (BZN) | Bozeman | MT | Challis to Bozeman Yellowstone International |
| Creston Valley Regional (CFQ) | Creston | BC | Challis to Creston Valley Regional |
| Yellowstone Regional (COD) | Cody | WY | Challis to Yellowstone Regional |
| Coeur D'alene/Pappy Boyington Field (COE) | Coeur D'Alene | ID | Challis to Coeur D'alene/Pappy Boyington Field |
| Casper/Natrona County International (CPR) | Casper | WY | Challis to Casper/Natrona County International |
| Cut Bank International (CTB) | Cut Bank | MT | Challis to Cut Bank International |
| Dillon (DLN) | Dillon | MT | Challis to Dillon |
| The Dalles Municipal/Columbia Gorge Regional (DLS) | The Dalles | OR | Challis to The Dalles Municipal/Columbia Gorge Regional |
| Delta Municipal (DTA) | Delta | UT | Challis to Delta Municipal |
| Cardston (EA6) | Cardston | AB | Challis to Cardston |
| Pangborn Memorial (EAT) | Wenatchee | WA | Challis to Pangborn Memorial |
| Taber (ED5) | Taber | AB | Challis to Taber |
| Bow Island (EF3) | Bow Island | AB | Challis to Bow Island |
| Claresholm Industrial (EJ4) | Claresholm | AB | Challis to Claresholm Industrial |
| Elko Regional/Harris Field (EKO) | Elko | NV | Challis to Elko Regional/Harris Field |
| Bowers Field (ELN) | Ellensburg | WA | Challis to Bowers Field |
| Ely/Yelland Field (ELY) | Ely | NV | Challis to Ely/Yelland Field |
| Kemmerer Municipal (EMM) | Kemmerer | WY | Challis to Kemmerer Municipal |
| Wendover (ENV) | Wendover | UT | Challis to Wendover |
| Ephrata Municipal (EPH) | Ephrata | WA | Challis to Ephrata Municipal |
| Eureka (EUE) | Eureka | NV | Challis to Eureka |
| Evanston-Uinta County Burns Field (EVW) | Evanston | WY | Challis to Evanston-Uinta County Burns Field |
| Fort Macleod (EY3) | Fort Macleod | AB | Challis to Fort Macleod |
| Fort Bridger Airport (FBR) | Fort Bridger | WY | Challis to Fort Bridger Airport |
| Glacier Park International (FCA) | Kalispell | MT | Challis to Glacier Park International |
| Foremost (FD4) | Foremost | AB | Challis to Foremost |
| Fillmore Municipal (FIL) | Fillmore | UT | Challis to Fillmore Municipal |
| Grand Coulee Dam (GCD) | Electric City | WA | Challis to Grand Coulee Dam |
| Spokane International (GEG) | Spokane | WA | Challis to Spokane International |
| South Big Horn County (GEY) | Greybull | WY | Challis to South Big Horn County |
| Gooding Municipal (GNG) | Gooding | ID | Challis to Gooding Municipal |
| Great Falls International (GTF) | Great Falls | MT | Challis to Great Falls International |
| Hermiston Municipal (HES) | Hermiston | OR | Challis to Hermiston Municipal |
| Helena Regional (HLN) | Helena | MT | Challis to Helena Regional |
| Havre City-County (HVR) | Havre | MT | Challis to Havre City-County |
| Cascade (ICS) | Cascade | ID | Challis to Cascade |
| Idaho Falls Regional (IDA) | Idaho Falls | ID | Challis to Idaho Falls Regional |
| Jackson Hole (JAC) | Jackson | WY | Challis to Jackson Hole |
| Grant County Regional/Ogilvie Field (JDA) | John Day | OR | Challis to Grant County Regional/Ogilvie Field |
| Jordan (JDN) | Jordan | MT | Challis to Jordan |
| Jackpot/Hayden Field (KPT) | Jackpot | NV | Challis to Jackpot/Hayden Field |
| La Grande/Union County (LGD) | La Grande | OR | Challis to La Grande/Union County |
| Logan-Cache (LGU) | Logan | UT | Challis to Logan-Cache |
| Lake County (LKV) | Lakeview | OR | Challis to Lake County |
| Hunt Field (LND) | Lander | WY | Challis to Hunt Field |
| Derby Field (LOL) | Lovelock | NV | Challis to Derby Field |
| Mission Field (LVM) | Livingston | MT | Challis to Mission Field |
| Wells Municipal/Harriet Field (LWL) | Wells | NV | Challis to Wells Municipal/Harriet Field |
| Lewiston-Nez Perce County (LWS) | Lewiston | ID | Challis to Lewiston-Nez Perce County |
| Lewistown Municipal (LWT) | Lewistown | MT | Challis to Lewistown Municipal |
| Madras Municipal (MDJ) | Madras | OR | Challis to Madras Municipal |
| Malad City (MLD) | Malad City | ID | Challis to Malad City |
| Malta (MLK) | Malta | MT | Challis to Malta |
| Mount Pleasant (MSD) | Mount Pleasant | UT | Challis to Mount Pleasant |
| Missoula International (MSO) | Missoula | MT | Challis to Missoula International |
| Grant County International (MWH) | Moses Lake | WA | Challis to Grant County International |
| Mccall Municipal (MYL) | Mc Call | ID | Challis to Mccall Municipal |
| Nephi Munivipal (NPH) | Nephi | UT | Challis to Nephi Munivipal |
| Manti-Ephraim (NTJ) | Manti | UT | Challis to Manti-Ephraim |
| Ogden/Hinckley (OGD) | Ogden | UT | Challis to Ogden/Hinckley |
| Omak (OMK) | Omak | WA | Challis to Omak |
| Ontario Municipal (ONO) | Ontario | OR | Challis to Ontario Municipal |
| Eastern Oregon Regional Pendleton (PDT) | Pendleton | OR | Challis to Eastern Oregon Regional Pendleton |
| Pocatello Regional (PIH) | Pocatello | ID | Challis to Pocatello Regional |
| Powell Municipal (POY) | Powell | WY | Challis to Powell Municipal |
| Prineville (PRZ) | Prineville | OR | Challis to Prineville |
| Tri-Cities (PSC) | Pasco | WA | Challis to Tri-Cities |
| Carbon County Regional/Buck Davis Field (PUC) | Price | UT | Challis to Carbon County Regional/Buck Davis Field |
| Pullman/Moscow Regional (PUW) | Pullman | WA | Challis to Pullman/Moscow Regional |
| Provo Municipal (PVU) | Provo | UT | Challis to Provo Municipal |
| Roberts Field (RDM) | Redmond | OR | Challis to Roberts Field |
| Riverton Regional (RIW) | Riverton | WY | Challis to Riverton Regional |
| Rock Springs Sweetwater County (RKS) | Rock Springs | WY | Challis to Rock Springs Sweetwater County |
| Richland (RLD) | Richland | WA | Challis to Richland |
| Roosevelt Municipal (ROL) | Roosevelt | UT | Challis to Roosevelt Municipal |
| Roundup (RPX) | Roundup | MT | Challis to Roundup |
| Rawlins Municipal/Harvey Field (RWL) | Rawlins | WY | Challis to Rawlins Municipal/Harvey Field |
| Rexburg-Madison County (RXE) | Rexburg | ID | Challis to Rexburg-Madison County |
| Salina-Gunnison (SBO) | Salina | UT | Challis to Salina-Gunnison |
| Shelby (SBX) | Shelby | MT | Challis to Shelby |
| Felts Field (SFF) | Spokane | WA | Challis to Felts Field |
| Sheridan County (SHR) | Sheridan | WY | Challis to Sheridan County |
| Salt Lake City International (SLC) | Salt Lake City | UT | Challis to Salt Lake City International |
| Lemhi County (SMN) | Salmon | ID | Challis to Lemhi County |
| Friedman Memorial (SUN) | Hailey | ID | Challis to Friedman Memorial |
| Sunriver (SUO) | Sunriver | OR | Challis to Sunriver |
| Hot Springs County-Thermopolis Municipal (THP) | Thermopolis | WY | Challis to Hot Springs County-Thermopolis Municipal |
| Magic Valley Regional/Joslin Field (TWF) | Twin Falls | ID | Challis to Magic Valley Regional/Joslin Field |
| Vernal Regional (VEL) | Vernal | UT | Challis to Vernal Regional |
| Winnemucca Municipal (WMC) | Winnemucca | NV | Challis to Winnemucca Municipal |
| Pincher Creek (WPC) | Pincher Creek | AB | Challis to Pincher Creek |
| Worland Municipal (WRL) | Worland | WY | Challis to Worland Municipal |
| Yellowstone (WYS) | West Yellowstone | MT | Challis to Yellowstone |
| West Kootenay Regional (YCG) | Castlegar | BC | Challis to West Kootenay Regional |
| Yakima Air Terminal/Mcallister Field (YKM) | Yakima | WA | Challis to Yakima Air Terminal/Mcallister Field |
| Lethbridge (YQL) | Lethbridge | AB | Challis to Lethbridge |
| Sparwood Elk Valley (YSW) | Sparwood | BC | Challis to Sparwood Elk Valley |
| Canadian Rockies/Cranbrook Intl (YXC) | Cranbrook | BC | Challis to Canadian Rockies/Cranbrook Intl |
| Trail (YZZ) | Trail | BC | Challis to Trail |
| Grand Forks (ZGF) | Grand Forks | BC | Challis to Grand Forks |
| Nelson (ZNL) | Nelson | BC | Challis to Nelson |
