| 1 | TTF | 224th Flight Unit | Callsign: Cargo Unit, | RUS | AVCODES |
| 2 | TTF | 224th Flight Unit | | | ICAO1 |
| 3 | TTFA | TRANSPORTES FERNANDEZ | | | SCAC4 |
| 4 | TTFD | TRINITY TRANSPORT INC | | | SCAC4 |
| 5 | TTFE | TITAN TRANSFER INC | | | SCAC4 |
| 6 | TTFG | TRI STATE FREIGHT SHUTTLE, INC | | | SCAC1 |
| 7 | TTFK | TSD TRANSPORTATION LP (DIVISION INT | | | SCAC4 |
| 8 | TTFN | TRINITY TRANSPORTATION INC | | | SCAC4 |
| 9 | TTFO | T & T TRUCKING OF FLORIDA INC | | | SCAC4 |
| 10 | TTFP | T & T SUPERMARKET INC | | | SCAC4 |
| 11 | TTFV | TOTAL TRANSPORTATION SERVICES INC ( | | | SCAC4 |
| 12 | TTFX | Trailer Train Co. | added 4/1981; eliminated 1/1992 | | NAKINA |
| 13 | TTFX | TTX Co. | added 1/1992; 1/1994-7/2005 | | NAKINA |
| 14 | TTFX | Trailer Train Co./TTX Co. (assigned lightweight, four platform TOFC car capable of carrying 4 45' trailers. 2 trailers may be equipped with nose-mounted refrigeration units, and the other 2 trailers without nose-mounted reefer units. This intermodal flat is for operation between lift-on/lift-off terminals only) | added 4/1981; 7/1985-1/1994 | | NAKINA |
| 15 | TTFX | Trailer Train Co. | added 4/81; eliminated 1/92 | | NRHS |
| 16 | TTFX | TTX Co. | added 1/92 | | NRHS |
| 17 | TTFX | TTX Co. (lightweight, four platform TOFC car capable of carrying 4 45' trailers. 2 trailers may be equipped with nose-mounted refrigeration units, and the other 2 trailers without nose-mounted reefer units. This intermodal flat is for operation between lift on/lift off terminals only) | Jan-94 | | NRHS |
| 18 | TTFX | TTX COMPANY {TRAILER TRAIN COMPANY} | | | PWRC |
| 19 | TTFX | Trailer Train (TTX Corporation) | | | RSRV |
| 20 | TTFX | TTX COMPANY | | | SCAC4 |
| 21 | TTFY | TITAN FREIGHT SYSTEMS | | | SCAC4 |
