| 1 | CTT | Custom Air Transport, Inc. | Callsign: Catt, Ceased operations on 15 September 2002. Designator DG* recalled by IATA | USA | AVCODES |
| 2 | CTT | Custom Air Transport, Inc. | IATA: DG, Callsign: Catt, Designator DG* recalled by IATA | USA | AVCODES |
| 3 | CTT | Custom Air Transport, Inc. | IATA: 5R, Callsign: Catt, Comenced operations 09 December 1995. | USA | AVCODES |
| 4 | CTT | Custom Air Transport | | | ICAO1 |
| 5 | CTT | Connecticut Transit (CT Transit) | | USA | TRAFFIC |
| 6 | CTTA | CONTINENTAL COAL & SHIPPING INC | | | SCAC3 |
| 7 | CTTB | CITATION TRANSPORTATION INC | | | SCAC3 |
| 8 | CTTB | CONTINENTAL TRANSPORT INC | | | SCAC4 |
| 9 | CTTC | CIRCLE TRANSPORT CORPORATION | | | SCAC3 |
| 10 | CTTD | CLEAN HARBORS CATALYST TECHNOLOGIES | | | SCAC4 |
| 11 | CTTE | CENTRAL TRANSPORT INC | | | SCAC3 |
| 12 | CTTF | CATENCAMP TRANSFER & STORAGE INC | | | SCAC3 |
| 13 | CTTG | CATOM TRUCKING INC | | | SCAC3 |
| 14 | CTTG | COIL TRANS TRUCKING INC | | | SCAC4 |
| 15 | CTTH | CT TRANSPORT | | | SCAC4 |
| 16 | CTTI | CORNET TRANSPORT INC | | | SCAC3 |
| 17 | CTTI | CORNET TRANSPORT INC | | | SCAC4 |
| 18 | CTTJ | CT TRANSPORTATION | | | SCAC3 |
| 19 | CTTJ | COLUMBIA TAPING TOOLS LTD | | | SCAC4 |
| 20 | CTTK | COMET TRUCK LINE, INC | | | SCAC3 |
| 21 | CTTK | CHAMBERS, TOMMY TRUCKING | | | SCAC4 |
| 22 | CTTL | CT TRANSPORT LLC | | | SCAC4 |
| 23 | CTTL | CTT Livorno | | I | TRAFFIC |
| 24 | CTTM | CONN-MASS PIPE LINE INC | | | SCAC3 |
| 25 | CTTM | CONNECT TELECOMMUNICATIONS SOLUTION | | | SCAC4 |
| 26 | CTTN | CAN-TRUCK TRANSPORTATION DIVISION | | | SCAC3 |
| 27 | CTTO | C TRANSPORTATION CO | | | SCAC3 |
| 28 | CTTO | CIRCLE T TRANSORTATION INC | | | SCAC4 |
| 29 | CTTP | CT TRANSPOPRTATION | | | SCAC4 |
| 30 | CTTQ | C T TRANSPORTATION SYSTEMS | | | SCAC3 |
| 31 | CTTQ | CTT INC | | | SCAC4 |
| 32 | CTTS | CONTAINER TRANSFER SERVICE | | | SCAC3 |
| 33 | CTTT | CONTINENTAL TRUCK & TOWING CO | | | SCAC3 |
| 34 | CTTU | CANTAS KIMYA SANAYI TICARET A.S. | | TR | BIC |
| 35 | CTTV | CRESTON TRANSPORTATION INC | | | SCAC4 |
| 36 | CTTW | COTTONWOOD COMMODITIES | | | SCAC4 |
| 37 | CTTX | TTX Co. | added 1/1992; 1/1994-7/2005 | | NAKINA |
| 38 | CTTX | Trailer Train Co. | added 4/1961; 4/1961-1/1975; eliminated 1/1976; added 4/1976; 1/1980; eliminated 1/1992 | | NAKINA |
| 39 | CTTX | General American Transportation Corp. | 7/1937-1/1946 | | NAKINA |
| 40 | CTTX | Canton Tank Car Co. | 7/1930-7/1935 | | NAKINA |
| 41 | CTTX | Trailer Train Co. (not defined) | added 4/1961; 4/1961 | | NAKINA |
| 42 | CTTX | Trailer Train Co. (FC flat cars equipped with container adapters, trailer hitches, bridge plates and safety chains) | 4/1963-7/1965 | | NAKINA |
| 43 | CTTX | Trailer Train Co. (FC flat cars equipped with container adapters, trailer hitches and bridge plates) | 10/1966-1/1975 | | NAKINA |
| 44 | CTTX | Trailer Train Co. | eliminated 1/1976; added 4/1976 | | NAKINA |
| 45 | CTTX | Trailer Train Co./TTX Co. (flat cars equipped with coverless enclosed tri-level auto racks furnished by participant railroads) | 1/1980-7/2000 | | NAKINA |
| 46 | CTTX | Canton Tank Car Co. | Apr-38 | | NRHS |
| 47 | CTTX | Trailer Train Co. | added 4/61; 4/61-7/65 | | NRHS |
| 48 | CTTX | Trailer Train Co. (FC flat cars equipped with container adapters, trailer hitches and bridge plates) | 10/66-1/75 | | NRHS |
| 49 | CTTX | Trailer Train Co. | added 4/76 | | NRHS |
| 50 | CTTX | Trailer Train Co. (flat cars equipped with coverless enclosed tri-level auto racks furnished by participant railroads) | 1/80; eliminated 1/92 | | NRHS |
| 51 | CTTX | TTX Co. (flat cars equipped with coverless enclosed tri-level auto racks furnished by participant railroads) | added 1/92; 1/94-7/2000 | | NRHS |
| 52 | CTTX | TTX COMPANY - TRAILER TRAIN CORP. {CANTON TANK CAR CO.; GATX} | | | PWRC |
| 53 | CTTX | Trailer Train (TTX Corporation) | | | RSRV |
| 54 | CTTX | TTX COMPANY | | | SCAC4 |
| 55 | CTTY | COOPERS TRUCK & TRAILER SERVICES IN | | | SCAC3 |
| 56 | CTTY | COUTTS LIBRARY SERVICES INC | | | SCAC4 |
| 57 | CTTZ | CENTRAL TRANSPORT INTERNATIONAL | | | SCAC4 |
