| 1 | SWK | General Aerospace, Inc. | Callsign: Skywalker, | CDN | AVCODES |
| 2 | SWK | General Aerospace | | | ICAO1 |
| 3 | SWK | Städtische Werke Krefeld AG, Krefelder Eisenbahn | Krefeld | D | privat-bahn.de |
| 4 | SWK | | City: Krefeld | D | TRAFFIC |
| 5 | SWK | SWK MOBIL GmbH | | DE | VKM |
| 6 | SWKA | SEA HAWK AIR INC | | | SCAC4 |
| 7 | SWKB | SWIFT TRUCKING USA INC | | | SCAC4 |
| 8 | SWKC | SWEET TRUCKING LLC | | | SCAC4 |
| 9 | SWKD | SOUTHWEST TRUCK INSURANCE AGENCY IN | | | SCAC4 |
| 10 | SWKF | SEAHAWK CONTAINER LINE | | | SCAC4 |
| 11 | SWKG | SWANN TRUCKING | | | SCAC4 |
| 12 | SWKI | SWIFT TRUCKING INC | | | SCAC4 |
| 13 | SWKJ | SCHWEIKERT TRUCKING LLC | | | SCAC4 |
| 14 | SWKL | Stadtwerke Kaiserslautern | City: Kaiserslautern | D | TRAFFIC |
| 15 | SWKM | SMITH, WAYNE TRUCKING INC | | | SCAC4 |
| 16 | SWKN | SOUTHTOWN TRUCKING INC | | | SCAC4 |
| 17 | SWKO | SWIFT & MCCORMICK TRUCKING INC | | | SCAC4 |
| 18 | SWKP | SIDEWALKS PLUS LTD | | | SCAC4 |
| 19 | SWKQ | SHADOW CAT TRUCKING CO INC | | | SCAC4 |
| 20 | SWKR | San Pedro & Southwestern Ry. Co. | added 1/1993; 1/1994-7/2000; eliminated 4/2004 | | NAKINA |
| 21 | SWKR | San Pedro & Southwestern Ry. Co. | added 1/93; 1/94-7/2000 | | NRHS |
| 22 | SWKR | SAN PEDRO & SOUTHWESTERN RAILWAY COMPANY | | | PWRC |
| 23 | SWKR | San Pedro and Southwestern Railway | | | RSRV |
| 24 | SWKS | SWIERLIK, STEVEN | | | SCAC4 |
| 25 | SWKW | SCOTT, WESLEY TRUCKING | | | SCAC4 |
| 26 | SWKY | STEWART TRUCKING | | | SCAC4 |
| 27 | SWKZ | Stadtwerke Konstanz | Real: SWK, City: Konstanz | D | TRAFFIC |
