| 1 | TN | Air Tahiti Nui | ICAO: THT, Callsign: Tahiti Airlines, IATA Prefix: 244, | PF | AVCODES |
| 2 | TN | Australian Airlines | ICAO: AUS, Callsign: Australina, Merged into Qantas in April 1994. | AUS | AVCODES |
| 3 | TN | {`Eastern Australian Airlines (East Coast (Commuter) Airlines Ltd.`};ZIPCODE= | ICAO: ECO, Subsidiary of Qantas | AUS | AVCODES |
| 4 | TN | Tampa Northern R.R. Co. | 7/1923 | | NAKINA |
| 5 | TN | Texas & Northern Ry. Co. | 1/1952-1/1994; eliminated 1/1999; 7/2000-7/2005 | | NAKINA |
| 6 | TN | Texas & Northern Ry. Co. | 1/52-1/94; eliminated 1/99; 7/2000 | | NRHS |
| 7 | TN | *TAMPA NORTHERN RAILROAD CO. | | | PWRC |
| 8 | TN | +TEXAS & NORTHERN RAILWAY | | | PWRC |
| 9 | TN | Texas and Northern Railway | | | RSRV |
| 10 | TN | TEXAS & NORTHERN | | | SCAC4 |
| 11 | TN | Texas & Northern | | USA | TRAFFIC |
| 12 | TN | TRENORD | | IT | VKM |
| 13 | TNA | Transasia Airways | IATA: GE, Callsign: Transasia, IATA Prefix: 170, Name changed to Transasia Airways Corporation | RC | AVCODES |
| 14 | TNA | Tanavco Airways Ltd. | Callsign: Tanavco, | EAT | AVCODES |
| 15 | TNA | Transasia Airways Corporation | IATA: GE, Callsign: Transasia, IATA Prefix: 170, Founded on 21 May 1951. Ceased operations on 22 November 2016. Name changed from Transasia Airways | RC | AVCODES |
| 16 | TNA | TransAsia Airways | IATA: GE | | ICAO1 |
| 17 | TNA | TransAsia Airways | | RC | TRAFFIC |
| 18 | TNAF | TRUE NORTH TRANSPORTATION INC | | | SCAC4 |
| 19 | TNAG | TRANSPORT ALAIN GIROUX ET FILS INC | | | SCAC4 |
| 20 | TNAI | TRANSPORTES AGUIRRE | | | SCAC4 |
| 21 | TNAN | TANA TRUCKING INC | | | SCAC4 |
| 22 | TNAO | TNT | | | SCAC4 |
| 23 | TNAR | THENAMARIS SHIPS MANAGEMENT INC | | | SCAC4 |
| 24 | TNAS | TRANS-AMERICAN TRUCKING SERVICE, INC | | | SCAC1 |
| 25 | TNAS | TRANS-AMERICAN TRUCKING SERVICE INC | | | SCAC4 |
| 26 | TNAU | TIONG NAM LOGISTICS SOLUTIONS SDN BHD | | MAL | BIC |
| 27 | TNAV | TRANSPORTES AVALOS S A DE C | | | SCAC4 |
| 28 | TNAX | TransAmerican Refining Corp. | added 7/1990; 1/1994; eliminated 1/2000; eliminated 4/2000; 7/2000-7/2005 (not listed) | | NAKINA |
| 29 | TNAX | TransAmerican Refining Corp. | added 7/90; 1/94; eliminated 1/2000; eliminated 4/2000; 7/2000 | | NRHS |
| 30 | TNAX | TRANSAMERICAN REFINING CORPORATION | | | PWRC |
| 31 | TNAX | TransAmerican Refining Corporation | | | RSRV |
| 32 | TNAX | TRANSAMERICAN REFINING CORPORATION | | | SCAC4 |
| 33 | TNB | Trans Air Benin | IATA: Y7, Callsign: Trans-Benin, | DY | AVCODES |
| 34 | TNB | Trans Air-Benin | | | ICAO1 |
| 35 | TNBA | TRANSBEAR | | | SCAC4 |
| 36 | TNBE | TONY & NANCY TRUCKING | | | SCAC4 |
| 37 | TNBJ | TRANSATLANTIC NORTH AMERICA INC | | | SCAC4 |
| 38 | TNBO | TRAN BROTHERS | | | SCAC4 |
| 39 | TNBP | TRANS CARIBBEAN LINE LTD | | | SCAC4 |
| 40 | TNBQ | TRANSBLUE INC | | | SCAC4 |
| 41 | TNBR | TRANS-SAAR B V | | | SCAC4 |
| 42 | TNBW | TNT BESTWAY TRANSPORTATION INC | | | SCAC4 |
| 43 | TNBY | TRANSBY INC | | | SCAC4 |
| 44 | TNBZ | THUNDER BASIN COAL COMPANY | | | PWRC |
| 45 | TNC | National Aviation Consultants Ltd. | Callsign: Natcom, | CDN | AVCODES |
| 46 | TNC | Transcancun Services, S.A. de C.V. | Callsign: Transcancun, | MEX | AVCODES |
| 47 | TNC | National Aviation Consultants | | | ICAO1 |
| 48 | TNCA | TRANSPORT NORMAND CHARLEBOIX INC | | | SCAC4 |
| 49 | TNCC | TITAN CLEAN ENERGY PROJECTS CORPORA | | | SCAC4 |
| 50 | TNCD | TRANSCEND INC | | | SCAC4 |
| 51 | TNCI | TRANSPORT NORVINIC INC | | | SCAC4 |
| 52 | TNCL | TRANSTITAN LLC | | | SCAC4 |
| 53 | TNCM | TRANSPORT CLEMAX INC | | | SCAC4 |
| 54 | TNCO | TRES NACIONES SISTEMA DE FLETES INT | | | SCAC4 |
| 55 | TNCP | TOWN & COUNTRY PETROLEUM MARKETING | | | SCAC4 |
| 56 | TNCQ | TRANSPORTES INTERNACIONALES IR SA D | | | SCAC4 |
| 57 | TNCS | TENACITY SHIPPING LIMITED | | | SCAC4 |
| 58 | TNCU | TAIYO NIPPON SANSO CORPORATION | | J | BIC |
| 59 | TNCU | TAIYO NIPPON SANSO CORPORATION | | | SCAC4 |
| 60 | TNCX | North American Car Corp. | added 7/1965; 7/1965-1/1980; eliminated 1/1984 | | NAKINA |
| 61 | TNCX | General Electric Railcar Services Corp. | added 1/1984; 1/1994; eliminated 1/2000 | | NAKINA |
| 62 | TNCX | General Electric Rail Services Corp. | added 1/2000; 7/2000-7/2005 | | NAKINA |
| 63 | TNCX | North American Car Corp. | added 7/65; 7/65-1/80 | | NRHS |
| 64 | TNCX | General Electric Railcar Services Corp. | 1/94; eliminated 1/2000 | | NRHS |
| 65 | TNCX | General Electric Rail Services Corp. | added 1/2000; 7/2000 | | NRHS |
| 66 | TNCX | (NATX) GENERAL ELECTRIC RAIL SERVICES CORP. - THE NESTLE CO. - LESSEE [N. AMERICAN CAR CORP.] | | | PWRC |
| 67 | TNCX | North American Car Corp (GE Rail Services) | | | RSRV |
| 68 | TNCX | GENERAL ELECTRIC RAILCAR SERVICES C | | | SCAC4 |
| 69 | TND | Aero Taxis Cessna, S.A. de C.V. | Callsign: Taxis Cessna, | MEX | AVCODES |
| 70 | TND | Aero Taxis Cessna | | | ICAO1 |
| 71 | TNDA | TRANSPORTES ANDRADE | | | SCAC4 |
| 72 | TNDC | TRAND INC | | | SCAC4 |
| 73 | TNDF | TOUCH OF CLASS LIMOUSINE AND | | | SCAC4 |
| 74 | TNDG | TRIPLE RANDOM INC | | | SCAC4 |
| 75 | TNDJ | TRANSPORTES DON JUANITO S A DE C V | | | SCAC4 |
| 76 | TNDK | TREL OF SARNIA LTD | | | SCAC4 |
| 77 | TNDL | TRANSPORT ANDRE LEVESQUE | | | SCAC4 |
| 78 | TNDO | TRANSPORTADORA NORTE DE CHIHUAHUA S | | | SCAC4 |
| 79 | TNDT | TANDET LOGISTICS INC | | | SCAC4 |
| 80 | TNDU | TCI SUPPLY CHAIN SOLUTIONS | | IND | BIC |
| 81 | TNE | Taxis Aereos Del Noroeste, S.A. de C.V. | Callsign: Taxinoroeste, | MEX | AVCODES |
| 82 | TNE | Taxis Aereos del Noroeste | | | ICAO1 |
| 83 | TNEA | TRANSPORT L'ALLIER S E N C | | | SCAC4 |
| 84 | TNEC | TRANS-FREIGHT SERVICES, INC | | | SCAC1 |
| 85 | TNEC | TRANS-FREIGHT SERVICES INC | | | SCAC4 |
| 86 | TNEF | TRANSPORTES NEUTRON | | | SCAC4 |
| 87 | TNEJ | TRANSPORTACIONES NACIONALES E INTER | | | SCAC4 |
| 88 | TNEK | TANNERY CREEK SYSTEMS INC | | | SCAC4 |
| 89 | TNEL | TRANSPORT NELSON ST-LAURENT INC | | | SCAC4 |
| 90 | TNEO | TRANSNET INC | | | SCAC4 |
| 91 | TNER | Texas Northeastern Division, Mid-Michigan R.R., Inc. | added 1/1991; 1/1994-7/2005 | | NAKINA |
| 92 | TNER | Texas Northeastern Division, Mid-Michigan R.R., Inc. | added 1/91; 1/94-7/2000 | | NRHS |
| 93 | TNER | TEXAS NORTHEASTERN DIV., MID-MICHIGAN RAILROAD, INC. | | | PWRC |
| 94 | TNER | Texas Northeastern Division Mid-Michigan Railroad | | | RSRV |
| 95 | TNER | TEXAS NORTHEASTERN DIVISION MID-MIC | | | SCAC4 |
| 96 | TNES | TRANSPORTES NETASA | | | SCAC4 |
| 97 | TNEU | TRANSNAV LINE | | | SCAC1 |
| 98 | TNEU | TRANSNAVE LINE | | | SCAC4 |
| 99 | TNEU | Tramways de Neuchâtel | Real: TN, City: Neuchâtel | CH | TRAFFIC |
| 100 | TNEV | TEAM NELSON | | | SCAC4 |
