| 1 | CTS | Center-South Ltd. | Callsign: Center-South, | RUS | AVCODES |
| 2 | CTS | Charters Ejecutivos S.A. de C.V. | Callsign: Executive, | MEX | AVCODES |
| 3 | CTS | Center-South | | | ICAO1 |
| 4 | CTS | | City: Strassbourg | F | TRAFFIC |
| 5 | CTSA | COMPETITIVE TRANSPORTATION INCORPOR | | | SCAC4 |
| 6 | CTSB | CITY TOWING INC | | | SCAC3 |
| 7 | CTSB | CTS | | | SCAC4 |
| 8 | CTSC | Calgary Transit System | Real: CTS | CDN | TRAFFIC |
| 9 | CTSD | C T S ENTERPRISES INC | | | SCAC3 |
| 10 | CTSE | Chicago, Terre Haute and Southeastern Ry. Co. (Chicago, Milwaukee, St. Paul and Pacific R.R. Co.) | 10/1966 | | NAKINA |
| 11 | CTSE | Chicago, Terre Haute & Southeastern Ry. | 4/1938-7/1965 | | NAKINA |
| 12 | CTSE | Chicago, Terre Haute & Southeastern Ry. Co. (Chicago, Milwaukee, St. Paul and Pacific R.R. Co.) | 7/1936 | | NAKINA |
| 13 | CTSE | Chicago, Terre Haute & Southeastern Ry. | 4/38-7/65 | | NRHS |
| 14 | CTSE | Chicago, Terre Haute and Southeastern Ry. Co. (Chicago, Milwaukee, St. Paul and Pacific R.R. Co.) | Oct-66 | | NRHS |
| 15 | CTSE | CHICAGO, TERRE HAUTE & SOUTEASTERN RY. | | | PWRC |
| 16 | CTSF | COAST TRANSFER & STORAGE | | | SCAC3 |
| 17 | CTSG | CTS INC | | | SCAC3 |
| 18 | CTSH | CHRISTMAN, SCOTT A | | | SCAC4 |
| 19 | CTSI | CENTURY TRANSPORTATION SERVICE | | | SCAC3 |
| 20 | CTSI | CENTURY TRANSPORTATION SERVICE | | | SCAC4 |
| 21 | CTSJ | COLUMBIA TRANSIT CORPORATION | | | SCAC3 |
| 22 | CTSJ | COMMERCIAL TRANSPORT SERVICE INC | | | SCAC4 |
| 23 | CTSK | CTS TRUCKING | | | SCAC3 |
| 24 | CTSK | CARTER TRANSPORTATION SOLUTIONS LLC | | | SCAC4 |
| 25 | CTSL | CUSTOM TRANSPORT LTD | | | SCAC3 |
| 26 | CTSL | CENTURY LOGISTICS PLUS LLC | | | SCAC4 |
| 27 | CTSM | CONTRACT TRANSPORTATION SYSTEMS CO. | | | SCAC3 |
| 28 | CTSM | C TRANSPORTATION SYSTEMS INC | | | SCAC4 |
| 29 | CTSN | CITRUS TRANSPORT SERVICE | | | SCAC3 |
| 30 | CTSO | CANNON TRANSFER & STORAGE COMPANY | | | SCAC3 |
| 31 | CTSO | CHEMICAL TRADER SHIPPING COMPANY LI | | | SCAC4 |
| 32 | CTSP | CLASSIC TRANSPORTATION SERVICES INC | | | SCAC3 |
| 33 | CTSP | CLASSIC TRANSPORTATION SERVICES INC | | | SCAC4 |
| 34 | CTSQ | CHAMBLESS TRANSFER AND STORAGE COMP | | | SCAC3 |
| 35 | CTSQ | CARGO TRANSPORTATION SERVICES INC | | | SCAC4 |
| 36 | CTSR | CUMBRES & TOLTEC SCENIC RAILROAD | | | PWRC |
| 37 | CTSR | CINCINNATI TRANSFER & STORAGE CO IN | | | SCAC3 |
| 38 | CTSR | CSM TRANSPORTATION SERVICES INC | | | SCAC4 |
| 39 | CTSR | Cumbres and Toltec Scenic Railroad | Real: C&TS | USA | TRAFFIC |
| 40 | CTSS | CONTRACT TRANSPORT SERVICES INC | | | SCAC3 |
| 41 | CTSS | CUSTOM TRUCK SALES INC | | | SCAC4 |
| 42 | CTST | CTS TRANSPORTATION LLC | | | SCAC4 |
| 43 | CTSU | CYCLIFE FRANCE SA | | F | BIC |
| 44 | CTSU | BIBBY BROS CO. | | | PWRC |
| 45 | CTSU | Bibby Bros (Socodei) | | | RSRV |
| 46 | CTSU | SOCODEI | | | SCAC4 |
| 47 | CTSW | CHASE TRANSPORTATION SERVICES | | | SCAC3 |
| 48 | CTSW | CON-TECH SYSTEMS LTD | | | SCAC4 |
| 49 | CTSX | CTC Cement Manufacturing Corp. | eliminated 1/2008 | | NAKINA |
| 50 | CTSX | CTS Cement Manufacturing Corp. | added 4/2007 | | NAKINA |
| 51 | CTSX | Chem Comp Systems, Inc. d/b/a CTS Cement Manufacturing, Inc.) | 7/2000-7/2005 (not listed) | | NAKINA |
| 52 | CTSX | Chem Comp Systems, Inc. | added 1/1997; eliminated 4/1997 | | NAKINA |
| 53 | CTSX | Chem Comp Systems, Inc. d/b/a CTS Cement Manufacturing, Inc.) | 1/1994 (not listed) | | NAKINA |
| 54 | CTSX | Coordinated Transportation Systems, Inc. | added 7/1956; 10/1957; eliminated 1/1958 | | NAKINA |
| 55 | CTSX | Coordinated Transportation Systems, Inc. | added 7/56; 10/57; eliminated 1/58 | | NRHS |
| 56 | CTSX | Chem Comp Systems, Inc. d/b/a CTS Cement Manufacturing, Inc.) | Jan-94 | | NRHS |
| 57 | CTSX | Chem Comp Systems, Inc. | added 1/97; eliminateed 4/97 | | NRHS |
| 58 | CTSX | Chem Comp Systems, Inc. d/b/a CTS Cement Manufacturing, Inc.) | Jul-00 | | NRHS |
| 59 | CTSX | *COORDINATED TRANSPORTATION SYSTEMS, INC. | | | PWRC |
| 60 | CTSX | +CHEM COMP SYSTEMS, INC. (DBA CTS CEMENT MANUFACTURING CORP.) | | | PWRC |
| 61 | CTSX | CTS Cement Manufacturing (Chem Comp Systems) | | | RSRV |
| 62 | CTSX | CTS CEMENT MANUFACTURING CORPORATIO | | | SCAC4 |
| 63 | CTSY | COOPERATIVE SUPPLY INC | | | SCAC4 |
| 64 | CTSZ | CAROTRANS INTERNATIONAL | | | PWRC |
| 65 | CTSZ | Carotrans International | | | RSRV |
| 66 | CTSZ | CAROTRANS INTERNATIONAL | | | SCAC4 |
