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ASE (Aspen-Pitkin Co/Sardy Field, Aspen, United States)
ATW (Appleton International Airport, Appleton, United States)
AZO (Kalamazoo Battle Creek International Airport, Kalamazoo, United States)
BIL (Billings Logan International Airport, Billings, United States)
BIS (Bismarck Municipal Airport, Bismarck, United States)
BOI (Boise Air Terminal/Gowen Field, Boise, United States)
BZN (Gallatin Field, Bozeman, United States)
CID (The Eastern Iowa Airport, Cedar Rapids, United States)
COS (City of Colorado Springs Municipal Airport, Colorado Springs, United States)
CWA (Central Wisconsin Airport, Wassau, United States)
DEN (Denver International Airport, Denver, United States)
DRO (Durango La Plata County Airport, Durango, United States)
DSM (Des Moines International Airport, Des Moines, United States)
DTW (Detroit Metropolitan Wayne County Airport, Detroit, United States)
EGE (Eagle County Regional Airport, Vail, United States)
FAR (Hector International Airport, Fargo, United States)
FLG (Flagstaff Pulliam Airport, Flagstaff, United States)
FNT (Bishop International Airport, Flint, United States)
FSD (Joe Foss Field Airport, Sioux Falls, United States)
GJT (Grand Junction Regional Airport, Grand Junction, United States)
GRB (Austin Straubel International Airport, Green Bay, United States)
GRI (Central Nebraska Regional Airport, Grand Island, United States)
GRR (Gerald R. Ford International Airport, Grand Rapids, United States)
HDN (Yampa Valley Airport, Hayden, United States)
IDA (Idaho Falls Regional Airport, Idaho Falls, United States)
JAC (Jackson Hole Airport, Jacksn Hole, United States)
LAN (Capital City Airport, Lansing, United States)
LSE (La Crosse Municipal Airport, La Crosse, United States)
MKE (General Mitchell International Airport, Milwaukee, United States)
MQT (Sawyer International Airport, Gwinn, United States)
MSN (Dane County Regional Truax Field, Madison, United States)
MSO (Missoula International Airport, Missoula, United States)
MSP (Minneapolis-St Paul International/Wold-Chamberlain Airport, Minneapolis, United States)
MTJ (Montrose Regional Airport, Montrose CO, United States)
ORD (Chicago O Hare International Airport, Chicago, United States)
OMA (Eppley Airfield, Omaha, United States)
RAP (Rapid City Regional Airport, Rapid City, United States)
RST (Rochester International Airport, Rochester, United States)
SAF (Santa Fe Municipal Airport, Santa Fe, United States)
SGU (St George Municipal Airport, Saint George, United States)
SLC (Salt Lake City International Airport, Salt Lake City, United States)
TVC (Cherry Capital Airport, Traverse City, United States)
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SBO