| 1 | SKD | Sky Harbor Air Service, Inc. | Callsign: Sky Dwag, | USA | AVCODES |
| 2 | SKD | Skyguard Ltd. | Callsign: Skyguard, Ceased aviation business during 1990 | GB | AVCODES |
| 3 | SKD | Sky Harbor Air Service | | | ICAO1 |
| 4 | SKDA | SEMPER TRUCKING INC | | | SCAC4 |
| 5 | SKDB | SILKROAD LOGISTICS | | | SCAC4 |
| 6 | SKDE | SAN KARLOS S DE RL DE | | | SCAC4 |
| 7 | SKDF | STOCKARD ENTERPRISES INC | | | SCAC4 |
| 8 | SKDP | STRICKLAND & SONS PIPELINE INC | | | SCAC4 |
| 9 | SKDQ | SOKIL TRUCKING INC | | | SCAC4 |
| 10 | SKDR | SKANDACOR DIRECT INC | | | SCAC4 |
| 11 | SKDT | STRUCTURES DEREK INTERNATIONAL S A | | | SCAC4 |
| 12 | SKDY | SERHIENKO, DENNIS | | | SCAC4 |
