| 1 | SCA | South Central Air, Inc. | Callsign: South Central, | USA | AVCODES |
| 2 | SCA | South Central Air, Inc. | IATA: XE, Designator recalled by IATA | USA | AVCODES |
| 3 | SCA | Sierra Charlie Aviation, LLC | Callsign: Aviator, | USA | AVCODES |
| 4 | SCA | South Central Air | | | ICAO1 |
| 5 | SCAB | SCHIFFAHRTSKONTOR ALTES LAND GMBH & | | | SCAC4 |
| 6 | SCAD | SCANDIA EXPRESS INC | | | SCAC4 |
| 7 | SCAF | SCARLETT TRUCKING | | | SCAC4 |
| 8 | SCAG | SCR AIR SERVICE INC | | | SCAC4 |
| 9 | SCAH | SCHWAB, TIM R INC | | | SCAC4 |
| 10 | SCAI | SPENCER, C A INC | | | SCAC4 |
| 11 | SCAJ | SEA CAP INC | | | SCAC4 |
| 12 | SCAL | SCANDANAVIAN-AMERICAN LINES | | | PWRC |
| 13 | SCAL | S C ALPHA | | | SCAC4 |
| 14 | SCAN | SCANNAVINO, AL, TRUCKING, INC | | | SCAC1 |
| 15 | SCAN | SCANNAVINO, AL, TRUCKING | | | SCAC4 |
| 16 | SCANIA | Scania | | S | TRAFFIC |
| 17 | SCARD | Scarsdale Bus Company | | US-NY | TRAFFIC |
| 18 | SCAS | SOUTHERN CALIFORNIA MOVING & STORAG | | | SCAC4 |
| 19 | SCAT | SCAT DIVISION OF ABF FREIGHT | | | SCAC4 |
| 20 | SCAT | South Coast Area Transit | | US-CA | TRAFFIC |
| 21 | SCAU | SCA TRANSFOREST | | | SCAC4 |
| 22 | SCAW | SHADOWFAX CORPORATION, THE | | | SCAC4 |
| 23 | SCAX | Union Tank Car Co. | added 7/1956; 10/1957; eliminated 1/1958 | | NAKINA |
| 24 | SCAX | Shell Canada Ltd. | 10/1966 (not listed); added 4/1967; 4/1970-1/1980; eliminated 7/1981 | | NAKINA |
| 25 | SCAX | Shell Oil Co. of Canada, Ltd. | 7/1935-7/1954; eliminated 7/1956 | | NAKINA |
| 26 | SCAX | Shell Oil Co. of Canada, Ltd. | 4/38-1/52; eliminated 7/56 | | NRHS |
| 27 | SCAX | Union Tank Car Co. | added 7/56; 10/57; eliminated 1/58 | | NRHS |
| 28 | SCAX | Shell Canada Ltd. | added 4/67; 4/70-1/80; eliminated 7/81 | | NRHS |
| 29 | SCAX | *SHELL CANADA LTD. (UNION TANK CAR CO.) | | | PWRC |
| 30 | SCAX | *SOUTHERN CALIFORNIA REGIONAL RAIL AUTHORITY | | | PWRC |
| 31 | SCAX | Southern California Regional Rail Authority | | | RSRV |
| 32 | SCAX | SOUTHERN CALIFORNIA REGIONAL RAIL A | | | SCAC4 |
| 33 | SCAX | Metrolink, Southern California Regional Rail Authority | | USA | TRAFFIC |
| 34 | SCAZ | ASSIGNED FOR ATP | | | PWRC |
