| 9601 | TTD | Servicios Aereos Interestatales, S.A. de C.V. | Callsign: Interestatales, | MEX | AVCODES |
| 9602 | TTDA | TRANSPORTES DE ANDA SA DE CV | | | SCAC4 |
| 9603 | TTDB | TIRADOS TRANSPORT | | | SCAC4 |
| 9604 | TTDH | TEK TRANSPORTATION INC | | | SCAC4 |
| 9605 | TTDI | TRANSPORT DESIGN INTERNATIONAL INC | | | SCAC4 |
| 9606 | TTDJ | TRANSWEST TRANSPORT | | | SCAC4 |
| 9607 | TTDP | TRANS-TRADE INC | | | SCAC4 |
| 9608 | TTDR | TREES N TRENDS INC | | | SCAC4 |
| 9609 | TTDU | TRANSTAINER EXPRESS INC. | | CDN | BIC |
| 9610 | TTDX | Trailer Train Co. | added 1/1967; 10/1968-1/1980; eliminated 1/1992 | | NAKINA |
| 9611 | TTDX | TTX Co. | added 1/1992; 1/1994-7/2005 | | NAKINA |
| 9612 | TTDX | Trailer Train Co. | added 1/1967 | | NAKINA |
| 9613 | TTDX | Trailer Train Co. (FMS flat cars specifically equipped to carry military vehicles semi-saddleback) | 10/1968 | | NAKINA |
| 9614 | TTDX | Trailer Train Co. (flat cars, equipped with 16 tie-down winches with chains and bridge plates; for transporting military vehicles semi-saddleback style) | 4/1970-1/1980 | | NAKINA |
| 9615 | TTDX | Trailer Train Co./TTX Co. (flat cars equipped with 16 tie-down winches with chains and bridge plates; for transporting military vehicles) | 7/1985-1/1994 | | NAKINA |
| 9616 | TTDX | TTX Co. (flat cars equipped with 16 tie-down winches with chains and bridge plates; for transporting military vehicles, equipped with end of car cush.) | 7/2000 | | NAKINA |
| 9617 | TTDX | Trailer Train Co. | added 1/67 | | NRHS |
| 9618 | TTDX | Trailer Train Co. (FMS flat cars specifically equipped to carry military vehicles semi-saddleback) | Oct-68 | | NRHS |
| 9619 | TTDX | Trailer Train Co. | Apr-70 | | NRHS |
| 9620 | TTDX | Trailer Train Co. (flat cars, equipped with 16 tie-down winches with chains and bridge plates; for transporting military vehicles semi-saddleback style) | 1/75-1/80 | | NRHS |
| 9621 | TTDX | Trailer Train Co. | eliminated 1/92 | | NRHS |
| 9622 | TTDX | TTX Co. | added 1/92 | | NRHS |
| 9623 | TTDX | TTX Co. (flat cars equipped with 16 tie-down winches with chains and bridge plates; for transporting military vehicles) | Jan-94 | | NRHS |
| 9624 | TTDX | TTX Co. (flat cars equipped with 16 tie-down winches with chains and bridge plates; for transporting military vehicles, equipped with end of car cush.) | Jul-00 | | NRHS |
| 9625 | TTDX | TTX COMPANY {TRAILER TRAIN COMPANY} | | | PWRC |
| 9626 | TTDX | Trailer Train (TTX Corporation) | | | RSRV |
| 9627 | TTDX | TTX COMPANY | | | SCAC4 |
| 9628 | TTE | Trans Tasman Airlines | Callsign: Transtasman, | NZ | AVCODES |
| 9629 | TTE | Avcenter, Inc. | Callsign: Teton, | USA | AVCODES |
| 9630 | TTE | Avcenter | | | ICAO1 |
| 9631 | TTE | Trentino Trasporti Esercizio S.p.A. | | IT | VKM |
| 9632 | TTEA | TRANSPORT E A G | | | SCAC4 |
| 9633 | TTED | THOMPSON, TED LIVESTOCK INC | | | SCAC4 |
| 9634 | TTEF | T & T EXPRESS INC | | | SCAC4 |
| 9635 | TTEM | TOUR TECH EAST LIMITED | | | SCAC4 |
| 9636 | TTEN | TRANSPORT E L Z INC | | | SCAC4 |
| 9637 | TTEP | THIRTY THREE (33) EXPRESS LTD | | | SCAC4 |
| 9638 | TTER | Tomiko Tilden & Eastern Railway | | | RSRV |
| 9639 | TTES | TRANSMONTES S A DE C V | | | SCAC4 |
| 9640 | TTET | TITAN TRANSPORTATION LLC | | | SCAC4 |
| 9641 | TTEU | TEAMTEC AS | | N | BIC |
| 9642 | TTEX | Eason Oil Co. | 7/1930-4/1938 | | NAKINA |
| 9643 | TTEX | Tulsa Tank Line, H.H. Thiesen | 1/1945-4/1961 | | NAKINA |
| 9644 | TTEX | Tulsa Tank Line | 7/1965-10/1966; eliminated 4/1970 | | NAKINA |
| 9645 | TTEX | Trailer Train Co. | added 10/1987; eliminated 1/1992 | | NAKINA |
| 9646 | TTEX | TTX Co. | added 1/1992; 1/1994-7/2005 | | NAKINA |
| 9647 | TTEX | Trailer Train Co./TTX Co. (semi-permanently coupled TOFC car capable of carrying three trailers up to 57' long or four trailers up to 45' long between lift-on/lift-off terminals only) | added 10/1987; 10/1991-1/1992 | | NAKINA |
| 9648 | TTEX | TTX Co. (semi-permanently coupled TOFC cars. Cars with 6 digit numbers in the 161000 series are capable of carrying 3 trailers up to 57' long or 4 trailers up to 45' long between lift-on/lift-off terminals only. Cars with 6 digit numbers in the 353000 and 354000 series are capable of carrying 3 trailers up to 57' long only) | 1/1994-7/2000 | | NAKINA |
| 9649 | TTEX | Eason Oil Co. | Apr-38 | | NRHS |
| 9650 | TTEX | Tulsa Tank Line | 1/52-10/57 | | NRHS |
| 9651 | TTEX | Tulsa Tank Line, H.H. Thiesen | Apr-61 | | NRHS |
| 9652 | TTEX | Tulsa Tank Line | 7/65-10/66; eliminated 4/70 | | NRHS |
| 9653 | TTEX | Trailer Train Co. | added 10/87; eliminated 1/92 | | NRHS |
| 9654 | TTEX | TTX Co. | added 1/92 | | NRHS |
| 9655 | TTEX | TTX Co. (semi-permanently coupled TOFC cars. Cars with 6 digit numbers in the 161000 series are capable of carrying 3 trailers up to 57' long or 4 trailers up to 45' long between lift on/lift off terminals only. Cars with 6 digit numbers in the 353000 and 354000 series are capable of carrying 3 trailers up to 57' long only) | 1/94-7/2000 | | NRHS |
| 9656 | TTEX | *EASON OIL CO. | | | PWRC |
| 9657 | TTEX | *TULSA TANK LINE | | | PWRC |
| 9658 | TTEX | +TTX COMPANY {TRAILER TRAIN COMPANY} | | | PWRC |
| 9659 | TTEX | Trailer Train (TTX Corporation) | | | RSRV |
| 9660 | TTF | 224th Flight Unit | Callsign: Cargo Unit, | RUS | AVCODES |
| 9661 | TTF | 224th Flight Unit | | | ICAO1 |
| 9662 | TTFA | TRANSPORTES FERNANDEZ | | | SCAC4 |
| 9663 | TTFD | TRINITY TRANSPORT INC | | | SCAC4 |
| 9664 | TTFE | TITAN TRANSFER INC | | | SCAC4 |
| 9665 | TTFG | TRI STATE FREIGHT SHUTTLE, INC | | | SCAC1 |
| 9666 | TTFK | TSD TRANSPORTATION LP (DIVISION INT | | | SCAC4 |
| 9667 | TTFN | TRINITY TRANSPORTATION INC | | | SCAC4 |
| 9668 | TTFO | T & T TRUCKING OF FLORIDA INC | | | SCAC4 |
| 9669 | TTFP | T & T SUPERMARKET INC | | | SCAC4 |
| 9670 | TTFV | TOTAL TRANSPORTATION SERVICES INC ( | | | SCAC4 |
| 9671 | TTFX | Trailer Train Co. | added 4/1981; eliminated 1/1992 | | NAKINA |
| 9672 | TTFX | TTX Co. | added 1/1992; 1/1994-7/2005 | | NAKINA |
| 9673 | 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 |
| 9674 | TTFX | Trailer Train Co. | added 4/81; eliminated 1/92 | | NRHS |
| 9675 | TTFX | TTX Co. | added 1/92 | | NRHS |
| 9676 | 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 |
| 9677 | TTFX | TTX COMPANY {TRAILER TRAIN COMPANY} | | | PWRC |
| 9678 | TTFX | Trailer Train (TTX Corporation) | | | RSRV |
| 9679 | TTFX | TTX COMPANY | | | SCAC4 |
| 9680 | TTFY | TITAN FREIGHT SYSTEMS | | | SCAC4 |
| 9681 | TTG | Transtel SA | Callsign: Transtel, Ceased operations. | TG | AVCODES |
| 9682 | TTGB | TSD TRANSPORTATION, LP (DIVISION IN | | | SCAC4 |
| 9683 | TTGC | TECATE TRUCKING LLC | | | SCAC4 |
| 9684 | TTGD | TRANSPORT G D M INC | | | SCAC4 |
| 9685 | TTGE | TRIO TRUCKING INC (INTERMODAL DIVIS | | | SCAC4 |
| 9686 | TTGG | TRANSPORTES GALLEGO | | | SCAC4 |
| 9687 | TTGGE | Tyczka Gase GmbH | | DE | VKM |
| 9688 | TTGI | TRANSPORTATION GROUP INC | | | SCAC4 |
| 9689 | TTGJ | TRUMBLE TRUCKING LLC | | | SCAC4 |
| 9690 | TTGL | TRANSPORTES GALA | | | SCAC4 |
| 9691 | TTGM | TRANSPORTES GOMEZ | | | SCAC4 |
| 9692 | TTGO | TRANS CONTAINER | | | SCAC1 |
| 9693 | TTGO | TRIO TRUCKING INC | | | SCAC4 |
| 9694 | TTGP | TOPS TRUCKING, INC | | | SCAC1 |
| 9695 | TTGP | TOPS TRUCKING INC | | | SCAC4 |
| 9696 | TTGU | CHEMOVIL LTD | | | SCAC4 |
| 9697 | TTGX | Trailer Train Co. | 4/1970-1/1975; added 1/1977; 1/1980; eliminated 1/1992 | | NAKINA |
| 9698 | TTGX | TTX Co. | added 1/1992; 1/1994-7/2005 | | NAKINA |
| 9699 | TTGX | Trailer Train Co. | 4/1970 | | NAKINA |
| 9700 | TTGX | Trailer Train Co. (no definition) | 1/1975 | | NAKINA |
