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| Alaska Region |
- Anchorage, Alaska (AFC)
- Fairbanks, Alaska (AFG)
- Juneau, Alaska (AJK)
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| Central Region |
- Denver/Boulder, Colorado (BOU)
- Grand Junction, Colorado (GJT)
- Pueblo, Colorado (PUB)
- Chicago, Illinois (LOT)
- Lincoln, Illinois (ILX)
- Indianapolis, Indiana (IND)
- Northern Indiana (IWX)
- Davenport/Quad Cities, Iowa (DVN)
- Des Moines, Iowa (DMX)
- Dodge City, Kansas (DDC)
- Goodland, Kansas (GLD)
- Topeka, Kansas (TOP)
- Wichita, Kansas (ICT)
- Jackson, Kentucky (JKL)
- Louisville, Kentucky (LMK)
- Paducah, Kentucky (PAH)
- Detroit/Pontiac, Michigan (DTX)
- Gaylord, Michigan (APX)
- Grand Rapids, Michigan (GRR)
- Marquette, Michigan (MQT)
- Duluth, Minnesota (DLH)
- Minneapolis/Twin Cities, Minnesota (MPX)
- Kansas City/Pleasant Hill (EAX)
- Springfield, Missouri (SGF)
- St. Louis, Missouri (LSX)
- Hastings, Nebraska (GID)
- North Platte, Nebraska (LBF)
- Omaha/Valley, Nebraska (OAX)
- Bismarck, North Dakota (BIS)
- Grand Forks, North Dakota (FGF)
- Aberdeen, South Dakota (ABR)
- Rapid City, South Dakota (UNR)
- Sioux Falls, South Dakota (FSD)
- Green Bay, Wisconsin (GRB)
- La Crosse, Wisconsin (ARX)
- Milwaukee/Sullivan, Wisconsin (MKX)
- Cheyenne, Wyoming (CYS)
- Riverton, Wyoming (RIW)
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| Eastern Region |
- Caribou, Maine (CAR)
- Gray/Portland, Maine (GYX)
- Boston, Massachusetts (BOX)
- Mount Holly/Philadelphia, New Jersey (PHI)
- Albany, New York (ALY)
- Binghamton, New York (BGM)
- Buffalo, New York (BUF)
- New York/Upton, New York (OKX)
- Newport/Morehead City, North Carolina (MHX)
- Raleigh, North Carolina (RAH)
- Wilmington, North Carolina (ILM)
- Cleveland, Ohio (CLE)
- Wilmington, Ohio (ILN)
- Pittsburgh, Pennsylvania (PBZ)
- State College, Pennsylvania (CTP)
- Charleston, South Carolina (CHS)
- Columbia, South Carolina (CAE)
- Greenville-Spartanburg, South Carolina (GSP)
- Burlington, Vermont (BTV)
- Baltimore/Washington, Virginia (LWX)
- Blacksburg, Virginia (RNK)
- Wakefield, Virginia (AKQ)
- Charleston, West Virginia (RLX)
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| Pacific Region |
- Tiyan, Guam (GUM)
- Honolulu, Hawaii (HFO)
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| Southern Region |
- Birmingham, Alabama (BMX)
- Huntsville, Alabama (HUN)
- Mobile/Pensacola, Alabama (MOB)
- North Little Rock, Arkansas (LZK)
- Jacksonville, Florida (JAX)
- Key West, Florida (KEY)
- Melbourne, Florida (MLB)
- Miami, Florida (MFL)
- Tallahassee, Florida (TAE)
- Tampa, Florida (TBW)
- Peachtree City/Atlanta, Georgia (FFC)
- Lake Charles, Louisiana (LCH)
- New Orleans/Baton Rouge, Louisiana (LIX)
- Shreveport, Louisiana (SHV)
- Jackson, Mississippi (JAN)
- Albuquerque, New Mexico (ABQ)
- Norman/Oklahoma City, Oklahoma (OUN)
- Tulsa, Oklahoma (TSA)
- San Juan, Puerto Rico (SJU)
- Memphis, Tennessee (MEG)
- Morristown/Knoxville, Tennessee (MRX)
- Nashville, Tennessee (OHX)
- Amarillo, Texas (AMA)
- Austin/San Antonio, Texas (EWX)
- Brownsville, Texas (BRO)
- Corpus Christi, Texas (CRP)
- Dallas/Fort Worth, Texas (FWD)
- El Paso, Texas (EPZ)
- Houston/Galveston, Texas (HGX)
- Lubbock, Texas (LUB)
- Midland/Odessa, Texas (MAF)
- San Angelo, Texas (SJT)
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| Western Region |
- Flagstaff, Arizona (FGZ)
- Phoenix, Arizona (PSR)
- Tucson, Arizona (TWC)
- Eureka, California (EKA)
- Los Angeles/Oxnard, California (LOX)
- Sacramento, California (STO)
- San Diego, California (SGX)
- San Francisco Bay Area/Monterey, California (MTR)
- San Joaquin Valley/Hanford, California (HNX)
- Boise, Idaho (BOI)
- Pocatello, Idaho (PIH)
- Billings, Montana (BYZ)
- Glasgow, Montana (GGW)
- Great Falls, Montana (TFX)
- Missoula, Montana (MSO)
- Elko, Nevada (LKN)
- Las Vegas, Nevada (VEF)
- Reno, Nevada (REV)
- Medford, Oregon (MFR)
- Pendleton, Oregon (PDT)
- Portland, Oregon (PQR)
- Salt Lake City, Utah (SLC)
- Seattle, Washington (SEW)
- Spokane, Washington (OTX)
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