| 2001 | TCS | ATS, Private Company | Callsign: Techservice, | UA | AVCODES |
| 2002 | TCS | Transport- und Cargoservice GmbH | Hamburg | D | privat-bahn.de |
| 2003 | TCS | TACOMA SMELTER | | | PWRC |
| 2004 | TCS | TRANSPORTATION CONSULTING & | | | SCAC4 |
| 2005 | TCSA | TWIN CITY SHIPPERS ASSOCIATION INC | | | SCAC3 |
| 2006 | TCSA | TRANSPORTES CARRASCO | | | SCAC4 |
| 2007 | TCSD | TRANS-CONSOLIDATED INC | | | SCAC3 |
| 2008 | TCSE | THREE C'S EXPRESS INC | | | SCAC4 |
| 2009 | TCSF | TCSI-TRANSLAND INC | | | SCAC4 |
| 2010 | TCSG | TERRA COTTA SHIPPING LTD | | | SCAC3 |
| 2011 | TCSG | TRANSPORTES CARRASCO SA DE CV | | | SCAC4 |
| 2012 | TCSH | TRANS COASTAL SERVICES INC | | | SCAC3 |
| 2013 | TCSI | TRI-COUNTY SUPPLY INC | | | SCAC3 |
| 2014 | TCSI | TRI-COUNTY SUPPLY INC | | | SCAC4 |
| 2015 | TCSJ | T C S DISTRIBUTION INC | | | SCAC4 |
| 2016 | TCSL | TRICOASTAL TRANSPORT LTD | | | SCAC3 |
| 2017 | TCSN | TIMS CASINO EXPRESS INC | | | SCAC3 |
| 2018 | TCSN | T C AND SONS TRUCKING LLC | | | SCAC4 |
| 2019 | TCSR | (TCSZ) TRIPLE CROWN SERVICES INC. | | | PWRC |
| 2020 | TCSR | TRIPLE CROWN SERVICES INC | | | SCAC3 |
| 2021 | TCSR | TRIPLE CROWN SERVICES COMPANY | | | SCAC4 |
| 2022 | TCST | T C S T | | | SCAC3 |
| 2023 | TCSU | TANKCON B.V | | NL | BIC |
| 2024 | TCSU | TRANSCONTAINER SERVICE | | | SCAC3 |
| 2025 | TCSU | TRANSCONTAINER SERVICE | | | SCAC4 |
| 2026 | TCSV | TRANS-CHEM SERVICES INC | | | SCAC4 |
| 2027 | TCSW | TACOMA & SEATTLE TRAILER REPAIR INC | | | SCAC3 |
| 2028 | TCSW | TACOMA & SEATTLE TRAILER REPAIR INC | | | SCAC4 |
| 2029 | TCSX | Transcontinental Systems, Inc. | 4/1970 | | NAKINA |
| 2030 | TCSX | Tank Car Services, Inc. | added 1/1980; 1/1980; eliminated 1/1986 | | NAKINA |
| 2031 | TCSX | Transcontinental Systems, Inc. | Apr-70 | | NRHS |
| 2032 | TCSX | Tank Car Services, Inc. | added 1/80; 1/80; eliminated 1/86 | | NRHS |
| 2033 | TCSX | *TRANSCONTINENTAL SYSTEMS, INC. | | | PWRC |
| 2034 | TCSX | *TANK CAR SERVICES, INC. | | | PWRC |
| 2035 | TCSX | *TRINITY INDUSTRIES [TRANCISCO RAIL SERVICES CO.} | | | PWRC |
| 2036 | TCSX | Tank Car Services | | | RSRV |
| 2037 | TCSX | TEXAS CRUSHED STONE COMPANY | | | SCAC4 |
| 2038 | TCSY | TRANS-CONTINENTAL SYSTEM INC | | | SCAC3 |
| 2039 | TCSY | TRANS-CONTINENTAL SYSTEMS INC | | | SCAC4 |
| 2040 | TCSZ | *TRANSPORTATION CERTIFICATION SERVICES, INC. | | | PWRC |
| 2041 | TCSZ | *TRIPLE CROWN SERVICES COMPANY | | | PWRC |
| 2042 | TCSZ | Triple Crown Service | | | RSRV |
| 2043 | TCSZ | TRIPLE CROWN SERVICES INC | | | SCAC4 |
| 2044 | TCSZ | Triple Crown Services Company | | USA | TRAFFIC |
| 2045 | TCT | Transcontinental Sur S.R.L. | Callsign: Trans-Cont, | ROU | AVCODES |
| 2046 | TCT | Transcontinental Sur | | | ICAO1 |
| 2047 | TCT | Texas City Terminal Ry. Co. | 7/1923-7/2005 | | NAKINA |
| 2048 | TCT | Texas City Terminal Ry. Co. | 4/38-7/2000 | | NRHS |
| 2049 | TCT | TEXAS CITY TERMINAL RWY. | | | PWRC |
| 2050 | TCT | Texas City Terminal Railway | | | RSRV |
| 2051 | TCTA | TRICITY TRANSPORT CO | | | SCAC3 |
| 2052 | TCTA | TRES C TRANSPORTACION S A DE C V | | | SCAC4 |
| 2053 | TCTB | T C TRANSPORT INC | | | SCAC3 |
| 2054 | TCTB | T C TRUCKING OF MARION INC | | | SCAC4 |
| 2055 | TCTC | T C TRANSPORT INC | | | SCAC3 |
| 2056 | TCTC | TRICONT TRUCKING COMPANY | | | SCAC4 |
| 2057 | TCTD | TRI CITY DELIVERY | | | SCAC3 |
| 2058 | TCTD | TRANSPORTES CASTILLO | | | SCAC4 |
| 2059 | TCTE | TCBX INC | | | SCAC3 |
| 2060 | TCTF | T C TRANSPORT INC | | | SCAC3 |
| 2061 | TCTF | TWIN CITY TRANSFER & LOGISTICS LC | | | SCAC4 |
| 2062 | TCTG | TRICITY TRUCKING | | | SCAC3 |
| 2063 | TCTH | TAMAR CARGO TRANSPORT LLC | | | SCAC4 |
| 2064 | TCTI | T.C. TRANSPORTATION, INC | | | SCAC3 |
| 2065 | TCTI | T C TRANSPORTATION INC | | | SCAC4 |
| 2066 | TCTJ | T C TRANSPORT CO | | | SCAC3 |
| 2067 | TCTK | TRANSCAFE TRUCKING | | | SCAC4 |
| 2068 | TCTL | TENKE, CASEY TRUCKING LLC | | | SCAC4 |
| 2069 | TCTM | TRI-CITY MOVING & STORAGE | | | SCAC3 |
| 2070 | TCTM | TRI-CITY MOVING & STORAGE | | | SCAC4 |
| 2071 | TCTN | T C TRANSPORTATION INC | | | SCAC3 |
| 2072 | TCTO | TRI-CON TRANSPORTATION | | | SCAC3 |
| 2073 | TCTO | TRIPLE C TRANSPORTATION OF MS | | | SCAC4 |
| 2074 | TCTP | T & C TRANSPORTATION CO INC | | | SCAC3 |
| 2075 | TCTQ | TCT TRUCKING INC | | | SCAC3 |
| 2076 | TCTR | TC TRANS INC | | | SCAC4 |
| 2077 | TCTS | TC TRANSPORT CORP | | | SCAC3 |
| 2078 | TCTT | TRI-CITY TIRES INC | | | SCAC3 |
| 2079 | TCTT | TRUCK TIME TRANSPORT INC | | | SCAC4 |
| 2080 | TCTU | TI. CI. TI. SA | | CH | BIC |
| 2081 | TCTU | TRANSCONTAINER TECHNICAL SERVICES | | | SCAC3 |
| 2082 | TCTU | TCT TRANS CONTINENTAL TANK LTD | | | SCAC4 |
| 2083 | TCTV | TREASURE COAST TRAVEL AGENCY | | | SCAC3 |
| 2084 | TCTW | TWIN CITIES TOWING INC | | | SCAC3 |
| 2085 | TCTX | Tube City, Inc. | 7/2000-7/2005 (not listed) | | NAKINA |
| 2086 | TCTX | Tube City, Inc. | Jul-00 | | NRHS |
| 2087 | TCTX | TUBE CITY INCORPORATED | | | PWRC |
| 2088 | TCTX | Tube City | | | RSRV |
| 2089 | TCTY | TRI-COUNTY TRANSPORTATION CORPORATI | | | SCAC3 |
| 2090 | TCTY | TC TRANSPORTATION | | | SCAC4 |
| 2091 | TCTY | TransCity | | GB | TRAFFIC |
| 2092 | TCU | Inter Tropical Aviation | IATA: 3P, Callsign: Tropair, | SME | AVCODES |
| 2093 | TCU | TransGlobal Airways Corporation | IATA: T7, Callsign: Transglobal, Commenced operations in July 2005. | RP | AVCODES |
| 2094 | TCU | Transglobal Airways Corporation | | | ICAO1 |
| 2095 | TCUA | TAC TOTAL AUTOMATION AND CONTROLS S | | | SCAC4 |
| 2096 | TCUB | TSCHIRHARTS CUSTOM BILLIARDS INC | | | SCAC4 |
| 2097 | TCUC | TRI-COUNTY CHEMICAL INC | | | SCAC3 |
| 2098 | TCUE | TRI-COUNTY ENTERPRISES INC | | | SCAC3 |
| 2099 | TCUE | TRANSPORT COUET INC | | | SCAC4 |
| 2100 | TCUG | T C TRUCKING | | | SCAC3 |
