| 1 | CSX | Enterprise Consultants Ltd. | Callsign: Chaser, Name changed to Polestar Aviation. ICAO Callsign changed to Polestar | GB | AVCODES |
| 2 | CSX | Polestar Aviation | Callsign: Polestar, Name changed from Enterprise Consultants Ltd.. ICAO Callsign changed from Chaser | GB | AVCODES |
| 3 | CSX | Choice Airways, Inc | Callsign: Choice Air, | USA | AVCODES |
| 4 | CSX | Central Transportation Co., Inc. | 7/1954-1/1980; eliminated 10/1988 | | NAKINA |
| 5 | CSX | Central Soya Co., Inc. | 1/1952 | | NAKINA |
| 6 | CSX | Carnegie-Illinois Steel Co. | 7/1937; 4/1938 (not listed) | | NAKINA |
| 7 | CSX | Carnegie Steel Co. | 8/1920-7/1935 | | NAKINA |
| 8 | CSX | Central Soya Co., Inc. | Jan-52 | | NRHS |
| 9 | CSX | Central Transportation Co., Inc. | 10/57-1/80; eliminated 10/88 | | NRHS |
| 10 | CSX | *CARNEGIE-ILLINOIS STEEL CO. {CARNEGIE STEEL CO.] | | | PWRC |
| 11 | CSX | *CENTRAL SOYA CO., INC. | | | PWRC |
| 12 | CSX | *CENTRAL TRANSPORTATION CO. | | | PWRC |
| 13 | CSX | *CSX TRANSPORTATION, INC. | | | PWRC |
| 14 | CSX | Central Transportation | | | RSRV |
| 15 | CSX | CSX Corporation | Real: CSXT | USA | TRAFFIC |
| 16 | CSXA | CENTENNIAL SOUTHERN EXPRESS INC | | | SCAC4 |
| 17 | CSXB | CAMPBELL, SHANE B | | | SCAC4 |
| 18 | CSXC | CISTEX CORPORATION | | | SCAC3 |
| 19 | CSXD | C S D EXPRESS INC | | | SCAC3 |
| 20 | CSXD | C S D EXPRESS INC | | | SCAC4 |
| 21 | CSXE | CSX Transportation, Inc. | 1/1994-7/2005 | | NAKINA |
| 22 | CSXE | CSX Transportation, Inc. | 1/94-7/2000 | | NRHS |
| 23 | CSXE | CSX TRANSPORTATION, INC. | | | PWRC |
| 24 | CSXE | CSX Transportation End Of Train Devices | | | RSRV |
| 25 | CSXF | CALLIS TRANSPORTATION INC | | | SCAC4 |
| 26 | CSXG | CSL EXPRESS LINE | | | SCAC4 |
| 27 | CSXH | CS TRANSPORT LTD | | | SCAC4 |
| 28 | CSXI | CSX TRUCKING INC | | | SCAC3 |
| 29 | CSXI | CLASSIC EXPRESS INC | | | SCAC4 |
| 30 | CSXJ | COAST TRANSPORTATION | | | SCAC4 |
| 31 | CSXL | CSX LINES | | | SCAC3 |
| 32 | CSXL | CANADIAN STAR EXPRESS LTD | | | SCAC4 |
| 33 | CSXM | CTS TRANSPORTS LLC | | | SCAC4 |
| 34 | CSXN | CASCADE EXPRESS INC | | | SCAC3 |
| 35 | CSXN | C & S EXPRESS INC | | | SCAC4 |
| 36 | CSXO | CSX INTERMODAL, INC | | | SCAC3 |
| 37 | CSXO | CSX INTERMODAL INC | | | SCAC4 |
| 38 | CSXQ | CITY STAR EXPRESS LTD | | | SCAC4 |
| 39 | CSXR | CUSTOMS EXPRESS INC | | | SCAC3 |
| 40 | CSXT | CSX Transportation, Inc. | added 10/1987; 1/1994-7/2005 | | NAKINA |
| 41 | CSXT | CSX Transportation, Inc. | added 10/87; 1/94-7/2000 | | NRHS |
| 42 | CSXT | CSX TRANSPORTATION, INC. | | | PWRC |
| 43 | CSXT | CSX Transportation | | | RSRV |
| 44 | CSXT | CSX TRANSPORTATION | | | SCAC3 |
| 45 | CSXT | CSX TRANSPORTATION | | | SCAC4 |
| 46 | CSXU | CSX TRANSPORTATION, INC. | | | PWRC |
| 47 | CSXU | CSX Transportation | | | RSRV |
| 48 | CSXU | CSX TRANSPORTATION INC | | | SCAC4 |
| 49 | CSXW | CSK TRANSPORT LLC | | | SCAC4 |
| 50 | CSXX | Canadian Salt Co., Ltd. (Canadian Industries Ltd.) | 7/1930 | | NAKINA |
| 51 | CSXX | Canadian Salt Co., Ltd. | 7/1923 | | NAKINA |
| 52 | CSXX | CANADIAN INDUSTRIES LTD. [CANADIAN SALT CO.] | | | PWRC |
| 53 | CSXX | C & S EXPRESS INC | | | SCAC3 |
| 54 | CSXY | CARRS TRANSPORT INC | | | SCAC4 |
| 55 | CSXZ | CSX TRANSPORTATION, INC. | | | PWRC |
| 56 | CSXZ | CSX Transportation | | | RSRV |
| 57 | CSXZ | CSX TRANSPORTATION | | | SCAC4 |