| 1 | SIS | Saber Airlines | | ET | AVCODES |
| 2 | SIS | Scott Aviation, LLC d/b/a Silver Air | Callsign: Silver Speed, | USA | AVCODES |
| 3 | SIS | Saber Airlines | | | ICAO1 |
| 4 | SISB | SISTEMAS ECOLOGICOS PARA LA PROTECC | | | SCAC4 |
| 5 | SISD | SIS | | | SCAC4 |
| 6 | SISFC | SISTEMAS Y MONTAJES INDUSTRIALES, S.A. | | ES | VKM |
| 7 | SISG | SARNIA INSULATION SUPPLY (A DIVISIO | | | SCAC4 |
| 8 | SISI | SILVER SITE TRANSPORT LTD | | | SCAC4 |
| 9 | SISJ | SOMERS ISLES SHIPPING LTD | | | SCAC1 |
| 10 | SISJ | SOMERS ISLES SHIPPING LIMITED | | | SCAC4 |
| 11 | SISK | SISTAD TRUCKING | | | SCAC4 |
| 12 | SISL | SKIT INDUSTRIAL S DE RL DE CV | | | SCAC4 |
| 13 | SISM | SUPREME INTERNATIONAL SHIPPERS AND | | | SCAC4 |
| 14 | SISO | SISTEMAS DE TRAFICO INTERNACIONALES | | | SCAC4 |
| 15 | SISR | SISSON TRANSPORTATION INC | | | SCAC4 |
| 16 | SISU | ELBTAINER GMBH | | D | BIC |
| 17 | SISU | SCANDINAVIAN CARGO SEA A.B. | | | PWRC |
| 18 | SISU | Scandinavian Cargo Sea AB | | | RSRV |
| 19 | SISU | TRANSAMERICA LEASING | | | SCAC4 |
| 20 | SISW | SOLIS TRUCKING | | | SCAC4 |
