| 1 | SLH | Silverhawk Aviation, Inc. | Callsign: Silverhawk, | USA | AVCODES |
| 2 | SLH | Silverhawk Aviation | | | ICAO1 |
| 3 | SLH | St. Louis & Hannibal Ry. | 1/1941-7/1954 | | NAKINA |
| 4 | SLH | St. Louis & Hannibal Ry. | Jan-52 | | NRHS |
| 5 | SLH | *ST. LOUIS & HANNIBAL RWY. | | | PWRC |
| 6 | SLH | *SUGARLOAF & HAZLETON RAILROAD | | | PWRC |
| 7 | SLH | Sugarloaf and Hazelton Railroad | | | RSRV |
| 8 | SLHA | SLASHING CARROLL & KENNY LTD | | | SCAC4 |
| 9 | SLHC | STANDLEE HAY CO INC | | | SCAC4 |
| 10 | SLHD | SMITH, L & H FRUIT CO LIMITED | | | SCAC4 |
| 11 | SLHE | STEEL HORSE TRANSPORTATION INC | | | SCAC4 |
| 12 | SLHG | SILHOUETTE SHIPPING LTD | | | SCAC4 |
| 13 | SLHI | SUMMIT LOGISTICS INTERNATIONAL | | | SCAC4 |
| 14 | SLHK | STARLIGHT EXPRESS COACHES INC | | | SCAC4 |
| 15 | SLHL | STEMCELL TECHNOLOGIES INC | | | SCAC4 |
| 16 | SLHN | SALATHE OIL CO INC | | | SCAC4 |
| 17 | SLHO | SLH TRANSPORT INC | | | SCAC4 |
| 18 | SLHR | SALH TRUCKING (2001) LTD | | | SCAC4 |
| 19 | SLHT | SHOWA LINE, LTD. | | | PWRC |
| 20 | SLHT | SILHOUET-TONE | | | SCAC4 |
| 21 | SLHU | SEA LLOYD SHIPPING LINES PTE LTD | | SGP | BIC |
| 22 | SLHU | SHOWA LINE, LTD. | | | PWRC |
| 23 | SLHU | Showa Line Limited | | | RSRV |
| 24 | SLHU | TRANSAMERICA LEASING INC | | | SCAC4 |
| 25 | SLHX | SIOUXLAND HISTORICAL RAILROAD | | | PWRC |
| 26 | SLHY | SCHUGEL LOGISTICS INC | | | SCAC4 |
