| City | Country (Subdivision) | IATA | Airport | Notes |
| Birmingham | USA (Alabama) | BHM | Birmingham-Shuttlesworth International Airport | |
| Huntsville | USA (Alabama) | HSV | Huntsville International Airport | |
| Mobile | USA (Alabama) | MOB | Mobile Regional Airport | |
| Fayetteville | USA (Arkansas) | XNA | Northwest Arkansas Regional Airport | |
| Little Rock | USA (Arkansas) | LIT | Little Rock National Airport | |
| Phoenix | USA (Arizona) | PHX | Phoenix Sky Harbor International Airport | |
| Prescott | USA (Arizona) | PRC | Prescott Regional Airport, Ernest A. Love Field | |
| Tucson | USA (Arizona) | TUS | Tucson International Airport | |
| Bakersfield | USA (California) | BFL | Meadows Field Airport | |
| Burbank | USA (California) | BUR | Bob Hope Airport | |
| Eureka/Arcata | USA (California) | ACV | Arcata-Eureka Airport | |
| Fresno | USA (California) | FAT | Fresno Yosemite International Airport | |
| Los Angeles | USA (California) | LAX | Los Angeles International Airport | Hub |
| Mammoth Lakes | USA (California) | MMH | Mammoth Yosemite Airport | Seasonal |
| Monterey | USA (California) | MRY | Monterey Regional Airport | |
| Ontario | USA (California) | ONT | Ontario International Airport | |
| Oxnard | USA (California) | OXR | Oxnard Airport | Past destination |
| Palm Springs | USA (California) | PSP | Palm Springs International Airport | |
| Redding | USA (California) | RDD | Redding Municipal Airport | |
| Sacramento | USA (California) | SMF | Sacramento International Airport | |
| San Diego | USA (California) | SAN | San Diego International Airport | |
| San Francisco | USA (California) | SFO | San Francisco International Airport | Hub |
| San Jose | USA (California) | SJC | Norman Y. Mineta San Jose International Airport | |
| San Luis Obispo | USA (California) | SBP | San Luis Obispo County Regional Airport | |
| Santa Ana, Orange County | USA (California) | SNN | John Wayne Airport | |
| Santa Barbara | USA (California) | SBA | Santa Barbara Municipal Airport | |
| Santa Maria | USA (California) | SMX | Santa Maria Public Airport | |
| Santa Rosa | USA (California) | STS | Charles M. Schulz–Sonoma County Airport | |
| Alamosa | USA (Colorado) | ALS | San Luis Valley Regional Airport | |
| Aspen | USA (Colorado) | ASE | Aspen/Pitkin County Airport | |
| Colorado Springs | USA (Colorado) | COS | Colorado Springs Airport | |
| Denver | USA (Colorado) | DEN | Denver International Airport | Hub |
| Durango | USA (Colorado) | DRO | Durango-La Plata County Airport | |
| Montrose/Telluride | USA (Colorado) | MTJ | Montrose Regional Airport | |
| Pueblo | USA (Colorado) | PUB | Pueblo Memorial Airport | |
| Vail | USA (Colorado) | EGE | Eagle County Airport | |
| Fort Walton Beach | USA (Florida) | VPS | Destin–Fort Walton Beach Airport | |
| Jacksonville | USA (Florida) | JAX | Jacksonville International Airport | |
| Panama City | USA (Florida) | ECP | Northwest Florida Beaches International Airport | |
| Pensacola | USA (Florida) | PNS | Pensacola Regional Airport | |
| Atlanta | USA (Georgia) | ATL | Hartsfield-Jackson Atlanta International Airport | |
| Boise | USA (Idaho) | BOI | Boise Airport | |
| Idaho Falls | USA (Idaho) | IDA | Idaho Falls Regional Airport | |
| Chicago | USA (Illinois) | ORD | O'Hare International Airport | Hub |
| Decatur | USA (Illinois) | DEC | Decatur Airport | |
| Quincy | USA (Illinois) | UIN | Quincy Regional Airport | Discontinued Jan 7 2020 |
| Springfield | USA (Illinois) | SPI | Abraham Lincoln Capital Airport | |
| Fort Wayne | USA (Indiana) | FWA | Fort Wayne International Airport | |
| Indianapolis | USA (Indiana) | IND | Indianapolis International Airport | |
| South Bend | USA (Indiana) | SBN | South Bend International Airport | |
| Cedar Rapids | USA (Iowa) | CID | The Eastern Iowa Airport | |
| Des Moines | USA (Iowa) | DSM | Des Moines International Airport | |
| Sioux City | USA (Iowa) | SUX | Sioux Gateway Airport | |
| Dodge City | USA (Kansas) | DDC | Dodge City Regional Airport | |
| Hays | USA (Kansas) | HYS | Hays Regional Airport | |
| Liberal | USA (Kansas) | LBL | Liberal Mid-America Regional Airport | |
| Salina | USA (Kansas) | SLN | Salina Regional Airport | |
| Wichita | USA (Kansas) | ICT | Wichita Dwight D. Eisenhower National Airport | |
| Lexington | USA (Kentucky) | LEX | Blue Grass Airport | |
| Louisville | USA (Kentucky) | SDF | Louisville International Airport | |
| Paducah | USA (Kentucky) | PAH | Barkley Regional Airport | |
| Baton Rouge | USA (Louisiana) | BTR | Baton Rouge Metropolitan Airport | |
| Shreveport | USA (Louisiana) | SHV | Shreveport Regional Airport | |
| Detroit | USA (Michigan) | DTW | Detroit Metropolitan Wayne County Airport | |
| Grand Rapids | USA (Michigan) | GRR | Gerald R. Ford International Airport | |
| Flint | USA (Michigan) | FNT | Bishop International Airport | |
| Lansing | USA (Michigan) | LAN | Capital Region International Airport | |
| Traverse City | USA (Michigan) | TVC | Cherry Capital Airport | |
| Hancock/Houghton | USA (Michigan) | CMX | Houghton County Memorial Airport | |
| Kalamazoo | USA (Michigan) | AZO | Kalamazoo/Battle Creek International Airport | Past Destination [7] |
| Muskegon | USA (Michigan) | MKG | Muskegon County Airport | |
| Saginaw | USA (Michigan) | MBS | MBS International Airport | |
| Duluth | USA (Minnesota) | DLH | Duluth International Airport | |
| Minneapolis/St. Paul | USA (Minnesota) | MSP | Minneapolis-Saint Paul International Airport | |
| Rochester | USA (Minnesota) | RST | Rochester International Airport | |
| Jackson | USA (Mississippi) | JAN | Jackson–Medgar Wiley Evers International Airport | |
| Laurel/Hattiesburg | USA (Mississippi) | PIB | Hattiesburg-Laurel Regional Airport | |
| Meridian | USA (Mississippi) | MEI | Meridian Regional Airport | |
| Cape Girardeau | USA (Missouri) | CGI | Cape Girardeau Regional Airport | |
| Columbia | USA (Missouri) | COU | Columbia Regional Airport | |
| Kansas City | USA (Missouri) | MCI | Kansas City International Airport | |
| St. Louis | USA (Missouri) | STL | Lambert-Saint Louis International Airport | |
| Springfield | USA (Missouri) | SGF | Springfield-Branson National Airport | |
| Billings | USA (Montana) | BIL | Billings Logan International Airport | |
| Bozeman | USA (Montana) | BZN | Bozeman Yellowstone International Airport | |
| Great Falls | USA (Montana) | GTF | Great Falls International Airport | |
| Helena | USA (Montana) | HLN | Helena Regional Airport | |
| Kalispell | USA (Montana) | FCA | Glacier Park International Airport | FAA LID code is GPI |
| Missoula | USA (Montana) | MSO | Missoula International Airport | |
| Kearney | USA (Nebraska) | EAR | Kearney Regional Airport | |
| Lincoln | USA (Nebraska) | LNK | Lincoln Airport | |
| North Platte | USA (Nebraska) | LBF | North Platte Regional Airport | |
| Omaha | USA (Nebraska) | OMA | Eppley Airfield | |
| Scottsbluff | USA (Nebraska) | BFF | Western Nebraska Regional Airport | |
| Las Vegas | USA (Nevada) | LAS | Harry Reid International Airport | |
| Reno/Lake Tahoe | USA (Nevada) | RNO | Reno/Tahoe International Airport | |
| Albuquerque | USA (New Mexico) | ABQ | Albuquerque International Sunport | |
| Farmington | USA (New Mexico) | FMN | Four Corners Regional Airport | |
| Hobbs | USA (New Mexico) | HOB | Lea County Regional Airport | |
| Santa Fe | USA (New Mexico) | SAF | Santa Fe Regional Airport | |
| Albany | USA (New York) | ALB | Albany International Airport | |
| New York City | USA (New York) | LGA | LaGuardia Airport | |
| Ogdensburg | USA (New York) | OGS | Ogdensburg International Airport | |
| Plattsburg | USA (New York) | PBG | Plattsburgh International Airport | |
| Asheville | USA (North Carolina) | AVL | Asheville Regional Airport | Past destination |
| Charlotte | USA (North Carolina) | CLT | Charlotte/Douglas International Airport | |
| Bismarck | USA (North Dakota) | BIS | Bismarck Municipal Airport | |
| Dickinson | USA (North Dakota) | DIK | Dickinson Theodore Roosevelt Regional Airport | |
| Fargo | USA (North Dakota) | FAR | Hector International Airport | |
| Devils Lake | USA (North Dakota) | DVL | Devils Lake Regional Airport | |
| Jamestown | USA (North Dakota) | JMS | Jamestown Regional Airport | |
| Williston | USA (North Dakota) | XWA | Williston Basin International Airport | |
| Oklahoma City | USA (Oklahoma) | OKC | Will Rogers World Airport | |
| Tulsa | USA (Oklahoma) | TUL | Tulsa International Airport | |
| Akron | USA (Ohio) | CAK | Akron-Canton Regional Airport | |
| Cincinnati, Ohio area | USA (Kentucky) | CVG | Cincinnati/Northern Kentucky International Airport | Airport is in Kentucky |
| Cleveland | USA (Ohio) | CLE | Hopkins International Airport | |
| Columbus | USA (Ohio) | CMH | John Glenn Columbus International Airport | |
| Dayton | USA (Ohio) | DAY | Dayton International Airport | |
| North Bend | USA (Oregon) | OTH | Southwest Oregon Regional Airport | |
| Eugene | USA (Oregon) | EUG | Eugene Airport | |
| Portland | USA (Oregon) | PDX | Portland International Airport | |
| Redmond/Bend | USA (Oregon) | RDM | Roberts Field | |
| Harrisburg | USA (Pennsylvania) | MDT | Harrisburg International Airport | |
| Pittsburgh | USA (Pennsylvania) | PIT | Pittsburgh International Airport | |
| State College | USA (Pennsylvania) | SCE | University Park Airport | Past destination |
| Wilkes-Barre | USA (Pennsylvania) | AVP | Wilkes-Barre/Scranton International Airport | |
| Greenville/Spartanburg | USA (South Carolina) | GSP | Greenville-Spartanburg International Airport | |
| Pierre | USA (South Dakota) | PIR | Pierre Regional Airport | |
| Rapid City | USA (South Dakota) | RAP | Rapid City Regional Airport | |
| Sioux Falls | USA (South Dakota) | FSD | Sioux Falls Regional Airport | |
| Watertown | USA (South Dakota) | ATY | Watertown Regional Airport | |
| Chattanooga | USA (Tennessee) | CHA | Chattanooga Metropolitan Airport | |
| Knoxville | USA (Tennessee) | TYS | McGhee Tyson Airport | |
| Memphis | USA (Tennessee) | MEM | Memphis International Airport | |
| Nashville | USA (Tennessee) | BNA | Nashville International Airport | |
| Abilene | USA (Texas) | ABI | Abilene Regional Airport | |
| Amarillo | USA (Texas) | AMA | Rick Husband Amarillo International Airport | |
| Austin | USA (Texas) | AUS | Austin-Bergstrom International Airport | |
| Dallas–Fort Worth | USA (Texas) | DFW | Dallas/Fort Worth International Airport | |
| El Paso | USA (Texas) | ELP | El Paso International Airport | |
| Houston | USA (Texas) | IAH | George Bush Intercontinental Airport | Hub |
| Lubbock | USA (Texas) | LBB | Lubbock Preston Smith International Airport | |
| Midland | USA (Texas) | MAF | Midland International Airport | |
| San Antonio | USA (Texas) | SAT | San Antonio International Airport | |
| Victoria | USA (Texas) | VCT | Victoria Regional Airport | |
| Moab | USA (Utah) | CNY | Canyonlands Field | |
| Salt Lake City | USA (Utah) | SLC | Salt Lake City International Airport | |
| St. George | USA (Utah) | SGU | St. George Regional Airport | |
| Vernal | USA (Utah) | VEL | Vernal Regional Airport | |
| Burlington | USA (Vermont) | BTV | Burlington International Airport | |
| Richmond | USA (Virginia) | RIC | Richmond International Airport | |
| Staunton | USA (Virginia) | SHD | Shenandoah Valley Regional Airport | |
| Washington, D.C. area | USA (Virginia) | IAD | Washington Dulles International Airport | |
| Washington, D.C. area | USA (Virginia) | DCA | Ronald Reagan Washington National Airport | |
| Everett | USA (Washington) | PAE | Paine Field | Past destination |
| Pasco/Kennewick | USA (Washington) | PSC | Tri-Cities Airport | |
| Seattle-Tacoma | USA (Washington) | SEA | Seattle-Tacoma International Airport | |
| Spokane | USA (Washington) | GEG | Spokane International Airport | |
| Clarksburg | USA (West Virginia) | CKB | North Central West Virginia Airport | |
| Lewisburg | USA (West Virginia) | LWB | Greenbrier Valley Airport | |
| Appleton | USA (Wisconsin) | ATW | Appleton International Airport | Past destination |
| Eau Claire | USA (Wisconsin) | EAU | Chippewa Valley Regional Airport | |
| Green Bay | USA (Wisconsin) | GRB | Austin Straubel International Airport | Past destination |
| Madison | USA (Wisconsin) | MSN | Dane County Regional Airport | |
| Milwaukee | USA (Wisconsin) | MKE | Milwaukee Mitchell International Airport | |
| Wausau | USA (Wisconsin) | CWA | Central Wisconsin Airport | Past destination |
| Casper | USA (Wyoming) | CPR | Casper-Natrona County International Airport | |
| Cheyenne | USA (Wyoming) | CYS | Cheyenne Regional Airport | |
| Cody | USA (Wyoming) | COD | Yellowstone Regional Airport | |
| Gillette | USA (Wyoming) | GCC | Gillette–Campbell County Airport | |
| Jackson Hole | USA (Wyoming) | JAC | Jackson Hole Airport | |
| Laramie | USA (Wyoming) | LAR | Laramie Regional Airport | |
| Riverton | USA (Wyoming) | RIW | Central Wyoming Regional Airport | |
| Rock Springs | USA (Wyoming) | RKS | Southwest Wyoming Regional Airport | |
| Sheridan | USA (Wyoming) | SHR | Sheridan County Airport | |
| Calgary | Canada (Alberta) | YYC | Calgary International Airport | |
| Edmonton | Canada (Alberta) | YEG | Edmonton International Airport | |
| Vancouver | Canada (British Columbia) | YVR | Vancouver International Airport | |
| Ottawa | Canada (Ontario) | YOW | Ottawa Macdonald–Cartier International Airport | |
| Winnipeg | Canada (Manitoba) | YWG | Winnipeg James Armstrong Richardson International Airport | |
| Monterrey | Mexico (Nuevo León) | MTY | Monterrey International Airport | |
| Guanajuato | Mexico (Guanajuato) | SLP | Guanajuato International Airport | |
