| 1 | SRK | SkyWork SA | IATA: SX, Callsign: Skyfox, | CH | AVCODES |
| 2 | SRK | EATIS (European Aero Training Institute Strasbourg) | Callsign: Shark Jet, | F | AVCODES |
| 3 | SRK | | | | ICAO1 |
| 4 | SRKB | STERKS BAKERY | | | SCAC4 |
| 5 | SRKF | SPARKS TRANSPORTATION | | | SCAC4 |
| 6 | SRKI | STONER, R & K LOGISTICS INC | | | SCAC4 |
| 7 | SRKL | SCHROCK, LESTER L | | | SCAC4 |
| 8 | SRKM | SHARK MARINE TECHNOLOGIES | | | SCAC4 |
| 9 | SRKN | SUNRISE KITCHENS LLC | | | SCAC4 |
| 10 | SRKP | SPRING CREEK EXPRESS | | | SCAC4 |
| 11 | SRKQ | SPORTAK | | | SCAC4 |
| 12 | SRKR | SHIRKEY TRUCKING CORP | | | SCAC4 |
| 13 | SRKS | Strukton Rail GmbH & Co KG | | DE | VKM |
| 14 | SRKV | SAFE ROAD TRUCKING INC | | | SCAC4 |
| 15 | SRKX | Standard Refrigerator Car Co. | 7/1930-7/1932 | | NAKINA |
| 16 | SRKX | STANDARD REFRIGERATOR CAR CO. | | | PWRC |
| 17 | SRKY | S & R TRUCKING | | | SCAC4 |
