| 1 | WIT | Wittering FTU | Callsign: Striker, | GB | AVCODES |
| 2 | WIT | Wittering FTU | | | ICAO1 |
| 3 | WITC | WITRICITY | | | SCAC4 |
| 4 | WITF | WISCONSIN TRANSFER CO INC | | | SCAC4 |
| 5 | WITI | WEST ISLAND TOWING | | | SCAC4 |
| 6 | WITJ | WIT TRANSPORTATION LLC | | | SCAC4 |
| 7 | WITL | WINTERS TRUCK LINE, INC | | | SCAC1 |
| 8 | WITP | WILL TRANSPORT INC | | | SCAC4 |
| 9 | WITR | WILSON TRANSFER CO | | | SCAC1 |
| 10 | WITR | WILSON TRANSFER CO (A CORP) | | | SCAC4 |
| 11 | WITT | WITTERS TRANSPORTATION INC | | | SCAC4 |
| 12 | WITTF | Baugesellschaft Wittfeld GmbH | | DE | VKM |
| 13 | WITU | LANXESS ORGANOMETALLICS GMBH | | D | BIC |
| 14 | WITU | CROMPTON GMBH | | | SCAC4 |
| 15 | WITV | WOMEN IN THE INDUSTRY FUEL | | | SCAC4 |
| 16 | WITX | Witco Carbon Co. | 1/1950-7/1954; eliminated 10/1956 | | NAKINA |
| 17 | WITX | Continental Carbon Co. | added 4/1958; 4/1961-1/1980; eliminated 1/1985 | | NAKINA |
| 18 | WITX | Continental Carbon Co., wholly owned subsidiary of Witco Chemical Corp. | added 1/1985; eliminated 4/1986 | | NAKINA |
| 19 | WITX | Continental Carbon Co., wholly owned subsidiary of Witco Corp. | added 4/1986; 1/1994 | | NAKINA |
| 20 | WITX | Continental Carbon Co. | eliminated 1/1999 | | NAKINA |
| 21 | WITX | General Electric Railcar Services Corp. | added 1/1999; eliminated 1/2000 | | NAKINA |
| 22 | WITX | General Electric Rail Services Corp. | added 1/2000; 7/2000-7/2005; eliminated 4/2006 | | NAKINA |
| 23 | WITX | CCC Transport Co. | added 4/2006 | | NAKINA |
| 24 | WITX | Witco Carbon Co. | Jan-52 | | NRHS |
| 25 | WITX | Continental Carbon Co. | 4/61-1/80; eliminated 1/85 | | NRHS |
| 26 | WITX | Continental Carbon Co., wholly owned subsidiary of Witco Chemical Corp. | added 1/85; eliminated 4/86 | | NRHS |
| 27 | WITX | Continental Carbon Co., wholly owned subsidiary of Witco Corp. | added 4/86; 1/94 | | NRHS |
| 28 | WITX | Continental Carbon Co. | eliminated 1/99 | | NRHS |
| 29 | WITX | General Electric Railcar Services Corp. | added 1/99; eliminated 1/2000 | | NRHS |
| 30 | WITX | General Electric Rail Services Corp. | added 1/2000; 7/2000 | | NRHS |
| 31 | WITX | *CONTINENTAL CARBON CO., SUBS. WITCO CORP. | | | PWRC |
| 32 | WITX | +CCC TRANSPORT CO. [GENERAL ELECTRIC RAIL SERVICES CORP.] | | | PWRC |
| 33 | WITX | Continental Carbon | | | RSRV |
| 34 | WITX | CCC TRANSPORT COMPANY | | | SCAC4 |
| 35 | WITY | WILLIAMS, TYRONE TRUCKING | | | SCAC4 |