| 1 | SLX | Sky Line Airlines | Callsign: Slatour, | KZ | AVCODES |
| 2 | SLX | American Aircraft International, Inc. | Callsign: Shuttle Express, | USA | AVCODES |
| 3 | SLX | Sete Linhas Aereas | | | ICAO1 |
| 4 | SLXA | STALLION EXPRESS INC | | | SCAC4 |
| 5 | SLXB | STREAM LINKS EXPRESS INC | | | SCAC4 |
| 6 | SLXC | SELECT EXPRESS LLC | | | SCAC4 |
| 7 | SLXE | SOUTHLAND EXPRESS | | | SCAC4 |
| 8 | SLXH | SUMMERA | | | SCAC4 |
| 9 | SLXI | SEACON LOGIX INC | | | SCAC4 |
| 10 | SLXJ | STEEL LINE TRANSPORT | | | SCAC4 |
| 11 | SLXK | SHORT HAUL TRUCKING | | | SCAC4 |
| 12 | SLXL | SLT EXPRESS, INC | | | SCAC1 |
| 13 | SLXL | SLT EXPRESS INC | | | SCAC4 |
| 14 | SLXM | SALLEE TRANSPORT | | | SCAC4 |
| 15 | SLXN | SNOLINE EXPRESS INC | | | SCAC4 |
| 16 | SLXO | STI | | | SCAC4 |
| 17 | SLXP | SONLITE EXPRESS INCORPORATED | | | SCAC4 |
| 18 | SLXQ | SMART LINE EXPRESS INC | | | SCAC4 |
| 19 | SLXS | SHORELINE EXPRESS INC | | | SCAC4 |
| 20 | SLXT | SLOAN TRANSPORTATION | | | SCAC4 |
| 21 | SLXU | Stewart Lubricants & Service Co | | | RSRV |
| 22 | SLXU | STEWART LUBRICANTS & SERVICE CO, IN | | | SCAC4 |
| 23 | SLXV | SILT LEASING & TRANSPORTATION SERVI | | | SCAC4 |
| 24 | SLXY | SAMUEL TRANSPORT | | | SCAC4 |
