| 1 | CS | Continental Micronesia, Inc. | ICAO: CMI, Callsign: Air Mike, IATA Prefix: 596, | GUM | AVCODES |
| 2 | CS | Air Toronto | ICAO: SDR, Callsign: Soundair, Air Canada Connector | CDN | AVCODES |
| 3 | CS | Cambrian Airways Ltd. | Callsign: Cambrian, Merged into British Airways | GB | AVCODES |
| 4 | CS | Corse Air International | ICAO: CRL, Callsign: Charlie Sierra, IATA designator changed to SS. ICAO callsign changed to Corseair | F | AVCODES |
| 5 | CS | Comlux Aruba N.V. | ICAO: CXB, Callsign: Starlux, | ARU | AVCODES |
| 6 | CS | BNSF Ry. Co. | added 4/2005; 7/2005 | | NAKINA |
| 7 | CS | Burlington Northern Santa Fe Ry. Co. | 7/2000; eliminated 4/2005 | | NAKINA |
| 8 | CS | Burlington Northern R.R. Co. | added 4/1982; 1/1994 | | NAKINA |
| 9 | CS | The Colorado and Southern Ry. Co. | 1/1975-1/1980; eliminated 4/1982 | | NAKINA |
| 10 | CS | The Colorado and Southern Ry. Co. | 1/75-1/80; eliminated 4/82 | | NRHS |
| 11 | CS | Burlington Northern R.R. Co. | added 4/82; 1/94 | | NRHS |
| 12 | CS | Burlington Northern Santa Fe Ry. Co. | Jul-00 | | NRHS |
| 13 | CS | BNSF [BURLINGTON NORTHERN RAILROAD CO; COLORADO & SOUTHERN] | | | PWRC |
| 14 | CS | Colorado and Southern Railway (BNSF Railway) | | | RSRV |
| 15 | CS | The Colorado and Southern Ry. Co. | | USA | TRAFFIC |
| 16 | CSA | Czech Airlines A.S. , CSA | IATA: OK, Callsign: CSA-Lines, IATA Prefix: 064, | CZ | AVCODES |
| 17 | CSA | Ceskoslovenske Aerolinie (CSA) | IATA: OK, Callsign: CSA-Lines, IATA Prefix: 064, | CS | AVCODES |
| 18 | CSA | Czech Airlines | IATA: OK | | ICAO1 |
| 19 | CSA | Ceskoslovenske Aerolinie | | CS | TRAFFIC |
| 20 | CSAB | CASTANARES, ALBERTO G | | | SCAC3 |
| 21 | CSAB | CUSTOM ASSEMBLY INCORPORATED | | | SCAC4 |
| 22 | CSAC | CENTRAL STATES TRUCKING CO | | | SCAC3 |
| 23 | CSAC | CENTRAL STATES TRUCKING CO | | | SCAC4 |
| 24 | CSAD | CASCADE TRANSPORT INC | | | SCAC3 |
| 25 | CSAD | CASCADE TRANSPORT INC | | | SCAC4 |
| 26 | CSAD | | | CS | TRAFFIC |
| 27 | CSAE | C & S CARTAGE INC | | | SCAC3 |
| 28 | CSAG | CONECUH SAUSAGE COMPANY INC | | | SCAC4 |
| 29 | CSAH | COSTA TRUCK LINES | | | SCAC3 |
| 30 | CSAH | CARUSO TRUCKING LLC | | | SCAC4 |
| 31 | CSAI | C S A TRANSPORT INC | | | SCAC3 |
| 32 | CSAJ | C S & J TRUCKING INC | | | SCAC3 |
| 33 | CSAK | COSTA, TIM TRUCKING | | | SCAC3 |
| 34 | CSAL | CUSTOM ALUMINUM INC | | | SCAC4 |
| 35 | CSAN | CASTAN TRUCKING INC | | | SCAC3 |
| 36 | CSAN | CASTAN INC | | | SCAC4 |
| 37 | CSAO | CONRAIL SHARED ASSETS OPERATIONS | | | PWRC |
| 38 | CSAO | CROSSBORDER EXPRESS | | | SCAC4 |
| 39 | CSAP | CONTINENTAL SYSTEMS & CONCEPTS INC | | | SCAC3 |
| 40 | CSAP | CONTINENTAL SYSTEMS & CONCEPTS INC | | | SCAC4 |
| 41 | CSAQ | COLD STORAGE TRUCKING | | | SCAC3 |
| 42 | CSAQ | COSTA TRANSPORT LLC | | | SCAC4 |
| 43 | CSAR | COASTAL ARMORED CAR SERVICE INC | | | SCAC3 |
| 44 | CSAR | CAVAZOS ALANIS, EDGAR | | | SCAC4 |
| 45 | CSAT | CENTRAL STORAGE & TRANSFER CO | | | SCAC3 |
| 46 | CSAT | CENTRAL STORAGE & TRANSFER CO | | | SCAC4 |
| 47 | CSAU | CORPORATIVO DE SERVICIOS AMBIENTALES S.A DE C.V | | MEX | BIC |
| 48 | CSAU | COSTA LINE | | | PWRC |
| 49 | CSAU | Costa Line | | | RSRV |
| 50 | CSAU | CONTAINER SERVICE 'AMSTERDAM' | | | SCAC3 |
| 51 | CSAU | CORSA | | | SCAC4 |
| 52 | CSAV | SUDAMERICANA DE VAPORES | | | SCAC1 |
| 53 | CSAV | COASTAL AVIATION | | | SCAC4 |
| 54 | CSAX | Crucible Steel Co. of America | 7/1923; 1/1943-7/1954; eliminated 7/1956 | | NAKINA |
| 55 | CSAX | Crucible Steel Co. of America | 1/52; eliminated 7/56 | | NRHS |
| 56 | CSAX | CRUCIBLE sTEEL CO,. OF AMERICA | | | PWRC |
| 57 | CSAY | CASSIDY, ALLEN TRUCKING | | | SCAC3 |
| 58 | CSAY | CASSIDY, ALLEN TRUCKING | | | SCAC4 |
| 59 | CSB | Air Commerce | Callsign: Air Commerce, | BIH | AVCODES |
| 60 | CSB | 21 Air LLC | IATA: 2I, Callsign: Cargo South, IATA Prefix: 681, Founded on 25 February 2014. | USA | AVCODES |
| 61 | CSBB | C & S CHARTER | | | SCAC3 |
| 62 | CSBB | COMPRA Y VENTA DE METALES ROSAS | | | SCAC4 |
| 63 | CSBC | COLLINS, S B INC | | | SCAC4 |
| 64 | CSBD | CONSTELLATION SHIPPING LTD BERMUDA | | | SCAC3 |
| 65 | CSBE | CONTRERAS, BERNARDO S | | | SCAC3 |
| 66 | CSBE | CUSTOMER SPECIFIC CABLES S A DE C V | | | SCAC4 |
| 67 | CSBG | COLONIAL SURFACE SOLUTIONS INC | | | SCAC4 |
| 68 | CSBH | CSI TRUCKING | | | SCAC3 |
| 69 | CSBI | CROSBY TRUCKING SERVICE INC | | | SCAC3 |
| 70 | CSBI | CROSBY TRUCKING SERVICE INC | | | SCAC4 |
| 71 | CSBK | C & S BROKER | | | SCAC4 |
| 72 | CSBL | CUSTER, BILL | | | SCAC3 |
| 73 | CSBM | CLOSE BUILDING MATERIALS INC | | | SCAC3 |
| 74 | CSBM | CANTRAN ENTERPRISES LTD | | | SCAC4 |
| 75 | CSBN | CAUSEY BUS SERVICE | | | SCAC3 |
| 76 | CSBO | CROSBY & OVERTON TRANSPORTATION COM | | | SCAC3 |
| 77 | CSBP | CASEY BROKERAGE INC | | | SCAC4 |
| 78 | CSBQ | COSBY TRANSFER & STORAGE CORP | | | SCAC3 |
| 79 | CSBQ | CARGOWAYS WAREHOUSI | | | SCAC4 |
| 80 | CSBR | CARLSON, ROBERT M TRUCKING INC | | | SCAC3 |
| 81 | CSBR | CUSTARD STAND FOOD PRODUCTS, LLC | | | SCAC4 |
| 82 | CSBS | CSC TRANSPORT INC | | | SCAC4 |
| 83 | CSBT | CASTLE OIL CORPORATION | | | SCAC4 |
| 84 | CSBV | CIRCLE STAR TRANSPORT | | | SCAC4 |
| 85 | CSBW | COSBY, W G TRANSFER & STORAGE | | | SCAC3 |
| 86 | CSBX | Cargill, Inc. — Salt Division | added 4/1998; 7/2000-7/2005 | | NAKINA |
| 87 | CSBX | Cargill, Inc. -- Salt Division | added 4/98; 7/2000 | | NRHS |
| 88 | CSBX | CARGILL INCORPORATED - SALT DIVISION | | | PWRC |
| 89 | CSBX | Cargill Salt Division | | | RSRV |
| 90 | CSBX | CARGILL INC (SALT DIVISION) | | | SCAC4 |
| 91 | CSBY | C & S TRANSPORTATION SERVICES LLC | | | SCAC4 |
| 92 | CSC | Sichuan Airlines Co. Ltd. | IATA: N8, Callsign: Chuanhang, IATA designator changed to 3U | PRC | AVCODES |
| 93 | CSC | Caribbean Skyways St. Lucia Express | IATA: SL, Callsign: St. Lucia Express, | WL | AVCODES |
| 94 | CSC | Sichuan Airlines Co. Ltd. | IATA: 3U, Callsign: Sichuan, IATA designator changed from N8 | PRC | AVCODES |
| 95 | CSC | Sichuan Airlines | IATA: 3U | | ICAO1 |
| 96 | CSC | CHICAGO SIGHTSEEING COMPANY INC | | | SCAC4 |
| 97 | CSCA | CHESTER CARTAGE LTD | | | SCAC4 |
| 98 | CSCB | CASCO BAY LINES | | | SCAC3 |
| 99 | CSCC | C&S CARTAGE | | | SCAC3 |
| 100 | CSCD | Cascade and Columbia River R.R. Co. | added 10/1999; 7/2000-7/2005; eliminated 4/2006 | | NAKINA |
