| 1501 | TCCX | TCCX Corp. | added 4/80; eliminated 1/91; 1/94-7/2000 | | NRHS |
| 1502 | TCCX | *TAYLOR CHEMICAL CO. | | | PWRC |
| 1503 | TCCX | *THOMPSON APEX CO., DIV. CONTINENTAL OIL CO. [THOMPSON CHEMICAL CO.] | | | PWRC |
| 1504 | TCCX | *TRI-COUNTY COMMUTER RAIL AUTHORITY | | | PWRC |
| 1505 | TCCX | +TCCX CORPORATION [TRUMIX CONCERTE CO.] | | | PWRC |
| 1506 | TCCX | TCCX Corporation | | | RSRV |
| 1507 | TCCX | THOMPSON CHEMICAL CO | | | SCAC3 |
| 1508 | TCCY | TERMINAL CONSOLIDATION COMPANY INC | | | SCAC3 |
| 1509 | TCCY | TERRA-COM COMMUNICATIONS CORP | | | SCAC4 |
| 1510 | TCCZ | TREKKER CHEMICAL CO. | | | PWRC |
| 1511 | TCD | Tchad Airlines | Callsign: Tchadlines, | TCH | AVCODES |
| 1512 | TCD | Tchad Airlines | | | ICAO1 |
| 1513 | TCDA | TRANS-CANADA AUTO TRAIN TRANSPORT L | | | SCAC3 |
| 1514 | TCDA | THREE ZERO ZERO NINE FOUR FIVE NINE | | | SCAC4 |
| 1515 | TCDB | TRAMMELL CROW DISTRIBUTION CORP OF | | | SCAC3 |
| 1516 | TCDC | T C D C DELIVERY | | | SCAC3 |
| 1517 | TCDD | | | TR | TRAFFIC |
| 1518 | TCDD | Türkiye Cumhuriyeti Devlet Demiryollari Isletmesi | | TR | VKM |
| 1519 | TCDE | TRANS-CANADA EXPRESS INC | | | SCAC3 |
| 1520 | TCDE | TRAILER STORAGE INCORPORATED | | | SCAC4 |
| 1521 | TCDG | TRANSAMERICAN CARRIERS INC | | | SCAC3 |
| 1522 | TCDG | TARTARUGA DESIGN INC | | | SCAC4 |
| 1523 | TCDK | TOWERS CLAIR SHOWCO CANADA | | | SCAC4 |
| 1524 | TCDL | TRI-COUNTY DELIVERY INC | | | SCAC3 |
| 1525 | TCDN | TRANS-CONTINENTAL DISTRIBUTORS INC | | | SCAC3 |
| 1526 | TCDN | TRANSPORT CAMILLE DIONNE (1991) INC | | | SCAC4 |
| 1527 | TCDO | TERRCO DISTRIBHUTORS INC | | | SCAC3 |
| 1528 | TCDS | TWENTIETH (20TH) CENTURY DELIVERY S | | | SCAC3 |
| 1529 | TCDT | TCDC TRANSPORTATION INC | | | SCAC3 |
| 1530 | TCDT | T-CORDI TRANSPORT | | | SCAC4 |
| 1531 | TCDU | JIUJIANG TINCI MATERIALS TECHNOLOGY CO., LTD | | PRC | BIC |
| 1532 | TCDU | TRANSCONTINENTAL SERVICES LTD. | | | SCAC3 |
| 1533 | TCDV | TRI COUNTY DELIVERY | | | SCAC3 |
| 1534 | TCDX | Tank Car Despatchers Service, Inc. | added 4/1953; 7/1954-10/1957; eliminated 1/1958 | | NAKINA |
| 1535 | TCDX | Tennessee Chemical Co. | added 1/1983; eliminated 10/1984 | | NAKINA |
| 1536 | TCDX | Union Tank Car Co. | added 10/1984; 1/1994-7/2005 | | NAKINA |
| 1537 | TCDX | Tank Car Despatchers Service, Inc. | 10/57; eliminated 1/58 | | NRHS |
| 1538 | TCDX | Tennessee Chemical Co. | added 1/83; eliminated 10/84 | | NRHS |
| 1539 | TCDX | Union Tank Car Co. | added 10/84; 1/94-7/2000 | | NRHS |
| 1540 | TCDX | *TANK CAR DESPATCHERS SERVICE, IMC. | | | PWRC |
| 1541 | TCDX | +(UTCX) UNION TANK CAR CO. (TENNESSEE CHEMICAL COMPANY) | | | PWRC |
| 1542 | TCDX | Tennessee Chemical | | | RSRV |
| 1543 | TCDX | UNION TANK CAR COMPANY | | | SCAC4 |
| 1544 | TCDY | TRI-CITY DELIVERY | | | SCAC3 |
| 1545 | TCDY | TRANSPORTES COLOMBIA | | | SCAC4 |
| 1546 | TCE | Trans Colorado Airlines, Inc. | Callsign: Trans-Colorado, | USA | AVCODES |
| 1547 | TCE | Trans-Colorado Airlines | | | ICAO1 |
| 1548 | TCE | Tacoma Eastern Railway Company | Real: TE | USA | TRAFFIC |
| 1549 | TCEA | TRANSPORTES CANANEA SA DE CV | | | SCAC4 |
| 1550 | TCEC | T C E CORPORATION | | | SCAC3 |
| 1551 | TCED | TITAN CARTAGE LTD | | | SCAC3 |
| 1552 | TCED | TITAN CARTAGE LTD | | | SCAC4 |
| 1553 | TCEE | TRIPLE C EXPRESS LLC | | | SCAC4 |
| 1554 | TCEF | TRANSPORT COURNOYER 2011 INC | | | SCAC4 |
| 1555 | TCEG | TOWN & COUNTRY ENERGY CORP | | | SCAC4 |
| 1556 | TCEH | TRANS CITY EXPRESS, INC | | | SCAC3 |
| 1557 | TCEI | TC ENTERPRISES INC | | | SCAC3 |
| 1558 | TCEI | TRS CONTAINERS INC | | | SCAC4 |
| 1559 | TCEM | TRANS-CENTRAL EXPRESS INC | | | SCAC3 |
| 1560 | TCEM | TICO INC | | | SCAC4 |
| 1561 | TCEN | TRANSCEND CARRIERS INC | | | SCAC4 |
| 1562 | TCEP | TCE FREIGHTLINES | | | SCAC4 |
| 1563 | TCEP | Transport Călători Express Ploiești | Real: TCE, City: Ploiești | RO | TRAFFIC |
| 1564 | TCEQ | TRACERCO | | | SCAC4 |
| 1565 | TCER | TRAN-CON EXPRESS INC | | | SCAC3 |
| 1566 | TCES | TRANSCOM EXPRESS | | | SCAC4 |
| 1567 | TCET | T C E TRUCKING INC | | | SCAC3 |
| 1568 | TCET | TRANSPORT CFA INC | | | SCAC4 |
| 1569 | TCEU | TRANSCONTAINER EXPRESS LTD | | | SCAC3 |
| 1570 | TCEV | TRILLIUM CARGO EXPRESS INC | | | SCAC4 |
| 1571 | TCEW | TRANSPORTES CANTU | | | SCAC4 |
| 1572 | TCEY | TRACEY & SON LTD | | | SCAC4 |
| 1573 | TCF | Shuttle America | IATA: S5, Callsign: Shuttlecraft, Name changed to Shuttle America Corporation. ICAO callsign changed to Mercury. Designator S5 reinstated by IATA. Operates as US Airways Express | USA | AVCODES |
| 1574 | TCF | Shuttle America Corporation | IATA: S5, Callsign: Mercury, Merged into Republic Airline on 31 January 2017. Name changed from Shuttle America. ICAO callsign changed from Shuttlecraft. Designator S5 reinstated by IATA. Operates as US Airways Express | USA | AVCODES |
| 1575 | TCF | Shuttle America | IATA: S5 | | ICAO1 |
| 1576 | TCFB | TRANS-CONTINENTAL FREIGHT BUREAU (T | | | SCAC3 |
| 1577 | TCFB | TCF EXPRESS INC | | | SCAC4 |
| 1578 | TCFC | UMLER TEST ROAD NO. 7 | | | PWRC |
| 1579 | TCFE | TRI-COUNTY FUELS INC | | | SCAC4 |
| 1580 | TCFF | TOWN & COUNTRY FREIGHT FORWARDING L | | | SCAC3 |
| 1581 | TCFF | TRANSPORT SPECIALTIES INC | | | SCAC4 |
| 1582 | TCFG | TRANSNATIONAL FREIGHT LINES INC | | | SCAC3 |
| 1583 | TCFH | TONES TRUCKING | | | SCAC4 |
| 1584 | TCFI | TCF INDUSTRIES | | | SCAC3 |
| 1585 | TCFK | TILLAMOOK COUNTY CREAMERY ASSOCIATI | | | SCAC4 |
| 1586 | TCFL | TWIN CITY FREIGHT INC | | | SCAC3 |
| 1587 | TCFL | TWIN CITY FREIGHT INC | | | SCAC4 |
| 1588 | TCFM | TRANSPORT C F MORIN INC | | | SCAC4 |
| 1589 | TCFN | TOTAL - COMPAGNIE FRANCAISE DES PET | | | SCAC3 |
| 1590 | TCFO | TRI COUNTY FORKLIFT INC | | | SCAC3 |
| 1591 | TCFP | TRANSPORT COUTURE & FILS LTEE | | | SCAC4 |
| 1592 | TCFS | TRANS-COASTAL FREIGHT SYSTEMS INC | | | SCAC3 |
| 1593 | TCFS | TIME CRITICAL FREIGHT INC | | | SCAC4 |
| 1594 | TCFU | ADA-SERVICE LTD | | | SCAC4 |
| 1595 | TCFX | Temtor Corn & Fruit Products Co. | 8/1920 | | NAKINA |
| 1596 | TCFX | TEMTOR CORN & FRUIT PRODUCTS CO. | | | PWRC |
| 1597 | TCG | Thai Air Cargo Co., Ltd. | IATA: T2, Callsign: Thai Cargo, IATA Prefix: 284, Designator T2 reinstated by IATA | T | AVCODES |
| 1598 | TCG | Thai Air Cargo Co., Ltd. | IATA: T2, Callsign: Thai Cargo, IATA Prefix: 284, Designator T2 recalled by IATA | T | AVCODES |
| 1599 | TCG | Transafricaine Air Cargo | IATA: T3, Callsign: Africargo, IATA Prefix: 728, Designator T3 recalled by IATA. | BF | AVCODES |
| 1600 | TCG | Thai Air Cargo | IATA: T2 | | ICAO1 |
