| 1 | CSK | Flightcraft, Inc. | Callsign: Cascade, | USA | AVCODES |
| 2 | CSK | Catskill Airways | Callsign: Catskill, | USA | AVCODES |
| 3 | CSK | Flightcraft | | | ICAO1 |
| 4 | CSKA | CLASSIC AIRPORT SHUTTLE | | | SCAC3 |
| 5 | CSKB | CLEAN HARBORS OF NATICK INC | | | SCAC3 |
| 6 | CSKC | CHESAPEAKE CHARTER INC | | | SCAC3 |
| 7 | CSKD | CSK TANKERS PTE, LTD | | | SCAC3 |
| 8 | CSKG | CHASE TRUCKING | | | SCAC3 |
| 9 | CSKK | C & C TRANSPORTATION INC | | | SCAC3 |
| 10 | CSKL | CHRIS TRUCK LINE, R. A. Christopher, INC | | | SCAC3 |
| 11 | CSKM | C & S TRUCKING | | | SCAC3 |
| 12 | CSKN | CASSLE TRUCKING | | | SCAC3 |
| 13 | CSKO | C S & S TRUCKING CORP | | | SCAC3 |
| 14 | CSKQ | CHEASPEAKE OPERATING CO | | | SCAC3 |
| 15 | CSKR | C&S R.R. Corp. | 1/1994-7/2005 | | NAKINA |
| 16 | CSKR | C&S R.R. Corp. | 1/94-7/2000 | | NRHS |
| 17 | CSKR | CARBON & SCHUYKILL RAILROAD (C & S RAILROAD) | | | PWRC |
| 18 | CSKR | C and S Railroad | | | RSRV |
| 19 | CSKR | C & S RAILROAD CORPORATION | | | SCAC3 |
| 20 | CSKS | CONSTANT OIL CO | | | SCAC3 |
| 21 | CSKU | SHOUKANG MEDICAL SCIENCE AND TECHNOLOGY (SHANDONG) CO., LTD. | | PRC | BIC |
| 22 | CSKU | CONSOLIDATED SERVICES, INC. | | | PWRC |
| 23 | CSKU | Consolidated Services | | | RSRV |
| 24 | CSKU | CONSOLIDATION SERVICES, INC | | | SCAC3 |
| 25 | CSKX | Central States Enterprises, Inc. | added 1/1981; eliminated 4/1982 | | NAKINA |
| 26 | CSKX | Central States Grain & Trading Co. | added 10/1979; 1/1980; eliminated 1/1981 | | NAKINA |
| 27 | CSKX | Central States Grain & Trading Co. | 1/80; eliminated 1/81 | | NRHS |
| 28 | CSKX | Central States Enterprises, Inc. | added 1/81; eliminated 4/82 | | NRHS |
| 29 | CSKX | CENTRAL STATES ENTERPRISES, INC. [CENTRAL STATES GRAIN & TRADING CO.} | | | PWRC |
| 30 | CSKY | COLLINS, SHARON KAY | | | SCAC3 |
