| 1 | SLU | Avio Sluzba | Callsign: Avio Sluzbe, | YU | AVCODES |
| 2 | SLU | Avio Sluzba | | | ICAO1 |
| 3 | SLU | Salt Lake & Utah R.R. | 4/1938-7/1954 | | NAKINA |
| 4 | SLU | Salt Lake & Utah R.R. | 4/38-1/52 | | NRHS |
| 5 | SLU | SALT LAKE & UTAH RAILROAD CO. | | | PWRC |
| 6 | SLUA | STATE LINER USA INC | | | SCAC4 |
| 7 | SLUB | SUPERIOR LUBRICANTS INC | | | SCAC4 |
| 8 | SLUD | SLUDERS INC | | | SCAC4 |
| 9 | SLUE | SCHLUTER TRANSPORTATION | | | SCAC4 |
| 10 | SLUF | SAN LUIS TRUCKING INC | | | SCAC4 |
| 11 | SLUG | SLIDIN' U PHOTOGRAPHY | | | SCAC4 |
| 12 | SLUI | SOTTIL, LUIS STUDIOS USA INC | | | SCAC4 |
| 13 | SLUJ | STEVENS TRANSPORTATION LLC | | | SCAC4 |
| 14 | SLUK | SCOTT, L A TRUCKING | | | SCAC4 |
| 15 | SLUL | SPACE LINE TRUCKING LTD | | | SCAC4 |
| 16 | SLUN | SKY LINE TRUCKING INC | | | SCAC4 |
| 17 | SLUP | SCOT LUBRICANTS OF PA INC | | | SCAC4 |
| 18 | SLUPSK | Miejski Zakład Komunikacji Sp. z o.o. z siedzibą w Słupsku | | PL | TRAFFIC |
| 19 | SLUS | SUMMERS LUMBER & TIMBER COMPANY | | | SCAC4 |
