- Smyrna AirportIdent: KMQYServes: Smyrna
- Soldotna AirportIdent: PASXServes: Soldotna
- Sonora Municipal AirportIdent: KSOAServes: Sonora
- South Alabama Regional At Bill Benton Field AirportIdent: K79JServes: Andalusia/Opp
- South Arkansas Regional Airport at Goodwin FieldIdent: KELDServes: El Dorado
- South Bend International AirportIdent: KSBNServes: South Bend
- South Valley Regional AirportIdent: KU42Serves: Salt Lake City
- Southeast Colorado Regional AirportIdent: KLAAServes: Lamar
- Southeast Iowa Regional AirportIdent: KBRLServes: Burlington
- Southern Illinois AirportIdent: KMDHServes: Murphysboro
- Southwest Georgia Regional AirportIdent: KABYServes: Albany
- Southwest Oregon Regional AirportIdent: KOTHServes: North Bend
- Southwest Washington Regional AirportIdent: KKLSServes: Kelso
- Southwest Wyoming Regional AirportIdent: KRKSServes: Rock Springs
- Space Coast Regional AirportIdent: KTIXServes: Titusville
- Space Florida Launch and Landing FacilityIdent: KTTSServes: Titusville
- Sparrevohn LRRS AirportIdent: PASVServes: Sparrevohn
- Spirit of St Louis AirportIdent: KSUSServes: St Louis
- Springfield Branson National AirportIdent: KSGFServes: Springfield
- Springfield-Beckley Municipal AirportIdent: KSGHServes: Springfield
- St George AirportIdent: PAPBServes: St George
- St George Regional AirportIdent: KSGUServes: St George
- St Louis Regional AirportIdent: KALNServes: Alton/St Louis
- St Paul Island AirportIdent: PASNServes: St Paul Island
- St Simons Island AirportIdent: KSSIServes: St Simons Island
- State College Regional AirportIdent: KUNVServes: State College
- Stillwater Regional AirportIdent: KSWOServes: Stillwater
- Stinson Municipal AirportIdent: KSSFServes: San Antonio
- Stockton Metropolitan AirportIdent: KSCKServes: Stockton
- Sugar Land Regional AirportIdent: KSGRServes: Houston
- Tacoma Narrows AirportIdent: KTIWServes: Tacoma
- Talkeetna AirportIdent: PATKServes: Talkeetna
- Tallahassee International AirportIdent: KTLHServes: Tallahassee
- Taos Regional AirportIdent: KSKXServes: Taos
- Tatalina LRRS AirportIdent: PATLServes: Takotna
- Telluride Regional AirportIdent: KTEXServes: Telluride
- Terre Haute Regional Airport, Hulman FieldIdent: KHUFServes: Terre Haute
- Teterboro AirportIdent: KTEBServes: Teterboro
- Texarkana Regional Airport (Webb Field)Ident: KTXKServes: Texarkana
- Texas Gulf Coast Regional AirportIdent: KLBXServes: Angleton
- The Eastern Iowa AirportIdent: KCIDServes: Cedar Rapids
- The Ohio State University Airport - Don Scott FieldIdent: KOSUServes: Columbus
- Thief River Falls Regional AirportIdent: KTVFServes: Thief River Falls
- Tinker Air Force BaseIdent: KTIKServes: Oklahoma City
- Tom Madsen (Dutch Harbor) AirportIdent: PADUServes: Unalaska
- Tonopah AirportIdent: KTPHServes: Tonopah
- Topeka Regional AirportIdent: KFOEServes: Topeka
- Travis Air Force BaseIdent: KSUUServes: Fairfield
- Treasure Coast International AirportIdent: KFPRServes: Fort Pierce
- Trenton Mercer AirportIdent: KTTNServes: Ewing Township
- Tri Cities AirportIdent: KPSCServes: Pasco
- Tri-Cities Regional TN/VA AirportIdent: KTRIServes: Blountville
- Tri-State Airport / Milton J. Ferguson FieldIdent: KHTSServes: Huntington
- Troy Municipal Airport at N Kenneth Campbell FieldIdent: KTOIServes: Troy
- Truckee Tahoe AirportIdent: KTRKServes: Truckee
- Truth or Consequences Municipal AirportIdent: KTCSServes: Truth or Consequences
- Tucumcari Municipal AirportIdent: KTCCServes: Tucumcari
- Tulsa Riverside AirportIdent: KRVSServes: Tulsa
- Tupelo Regional AirportIdent: KTUPServes: Tupelo
- Tuscaloosa National AirportIdent: KTCLServes: Tuscaloosa