| 1 | SDE | Oy Soder Air Ltd. | IATA: OY, Callsign: Soder, Designator OY recalled by IATA | FIN | AVCODES |
| 2 | SDE | Oy Soder Air Ltd. | Callsign: Soder, Name changed to Airlink. Designator OY recalled by IATA | FIN | AVCODES |
| 3 | SDE | Air Partners Corp | Callsign: Stampede, | CDN | AVCODES |
| 4 | SDEA | SOLUTION IDEALE | | | SCAC4 |
| 5 | SDEC | SAUDER, C H TRUCKING LLC | | | SCAC4 |
| 6 | SDED | SPEE DEE DELIVERY SERVICE INC | | | SCAC4 |
| 7 | SDEH | SAC DELIVERY | | | SCAC4 |
| 8 | SDEHN | Sascha Dehn | | DE | VKM |
| 9 | SDEJ | SMITH, D L BROTHERS TRUCKING LLC | | | SCAC4 |
| 10 | SDEM | SMITH, DEAN TRUCKING | | | SCAC4 |
| 11 | SDEO | SUNDOWNER EXPRESS INC | | | SCAC4 |
| 12 | SDEQ | SHERIDAN LOGISTICS INC | | | SCAC4 |
| 13 | SDER | SAN DIEGO ELECTRIC RAILWAY | | | PWRC |
| 14 | SDER | San Diego Electric Railway | | | RSRV |
| 15 | SDET | SERVICE DE TRANSPORT BERNARD LEBLAN | | | SCAC4 |
| 16 | SDEW | SUMMIT DE | | | SCAC4 |
| 17 | SDEX | Swindell-Dresser Energy Supply Co. | added 1/1976; 1/1980-7/2000; eliminated 4/2001 | | NAKINA |
| 18 | SDEX | Savage-Harrington Energy | added 4/2001; eliminated 7/2005; 7/2005 (not listed) | | NAKINA |
| 19 | SDEX | Swindell-Dresser Energy Supply Co. | 1/80-7/2000; eliminated 4/2001 | | NRHS |
| 20 | SDEX | Savage-Harrington Energy | added 4/2001 | | NRHS |
| 21 | SDEX | SAVAGE-HARRINGTON ENERGY [SWINDELL-DRESSLER ENERGY SUPPLY CO.] | | | PWRC |
| 22 | SDEX | Swindell-Dressler Energy Supply | | | RSRV |
| 23 | SDEX | SAVAGE-HARRI | | | SCAC4 |
| 24 | SDEY | SEDIN TRUCKING | | | SCAC4 |
