| 1 | SCI | Special Cargo Airlines Joint Stock Aircompany | IATA: C7, Callsign: Special Cargo, | RUS | AVCODES |
| 2 | SCI | Servicios Aereos San Cristobal | Callsign: San Cristobal, | MEX | AVCODES |
| 3 | SCI | Servicios Aereos San Cristobal | | | ICAO1 |
| 4 | SCI | ST CLAIR BUS TRANSPORTATION INC | | | SCAC4 |
| 5 | SCIC | SEA CONTAINERS | | | PWRC |
| 6 | SCIC | SCHILLING, F J INC | | | SCAC4 |
| 7 | SCIF | SEACLIFF FARMS | | | SCAC4 |
| 8 | SCIG | SCHNEIDER NATIONAL CARRIERS INC-GUA | | | SCAC4 |
| 9 | SCIH | ISG South Chicago & Indiana Harbor Ry. Co. d/b/a South Chicago & Indiana Harbor Ry. Co. | 7/2005; eliminated 7/2007 | | NAKINA |
| 10 | SCIH | ISG SOUTH CHICAGO & INDIANA HARBOR RWY. CO. d/b/a SOUTH CHICAGO & INDIANA HARBOR RWY. CO. | | | PWRC |
| 11 | SCIH | ISG South Chicago and Indiana Harbor Railway | | | RSRV |
| 12 | SCIH | SOUTH CHICAGO & INDIANA HARBOR RAIL | | | SCAC4 |
| 13 | SCII | SOUTHEAST CONSOLIDATORS INC (LTL DI | | | SCAC4 |
| 14 | SCIJ | SAINT CATHERINES TRANSPORTATION | | | SCAC4 |
| 15 | SCIL | SCHIMMEL, ROBERT L | | | SCAC4 |
| 16 | SCIU | SANDHYA ORGANIC CHEMICALS PVT LTD | | IND | BIC |
| 17 | SCIU | SEA CONTAINERS | | | PWRC |
| 18 | SCIU | Sea Containers | | | RSRV |
| 19 | SCIU | SHIPPING CORP OF INDIA | | | SCAC1 |
| 20 | SCIW | SHOKER CARRIER INC | | | SCAC4 |
| 21 | SCIX | Samuel Cabot Inc. | 8/1920-4/1970; eliminated 7/1970 | | NAKINA |
| 22 | SCIX | Skeena Celluose, Inc. | added 10/1987; 1/1994; eliminated 7/1994 | | NAKINA |
| 23 | SCIX | General Electric Railcar Services Corp. | added 7/1994; eliminated 4/1998; added 4/1999; eliminated 1/2000 | | NAKINA |
| 24 | SCIX | General Electric Rail Services Corp. | added 1/2000; 7/2000-7/2005 | | NAKINA |
| 25 | SCIX | Samuel Cabot Inc. | 4/38-4/70; eliminated 7/70 | | NRHS |
| 26 | SCIX | Skeena Celluose, Inc. | added 10/87; 1/94; eliminated 7/94 | | NRHS |
| 27 | SCIX | General Electric Railcar Services Corp. | added 7/94; eliminated 4/98; added 4/99; eliminated 1/2000 | | NRHS |
| 28 | SCIX | General Electric Rail Services Corp. | added 1/2000; 7/2000 | | NRHS |
| 29 | SCIX | *SAMUEL CABOT INC | | | PWRC |
| 30 | SCIX | *SUNRISE COOPERATIVE, INC. | | | PWRC |
| 31 | SCIX | *SKEENA CELLULOSE, INC. | | | PWRC |
| 32 | SCIX | +(NATX) GENERAL ELECTRIC RAIL SERVICES CORPORATION | | | PWRC |
| 33 | SCIX | General Electric Rail Services Corporation | | | RSRV |
| 34 | SCIX | GENERAL ELECTRIC RAILCAR SERVICES C | | | SCAC4 |
| 35 | SCIY | SOUTH CENTRAL TRUCKING INC | | | SCAC4 |
| 36 | SCIZ | SOLO CUP INDUSTRIES | | | PWRC |
