| 1 | SIO | Sirio S.p.A. | Callsign: Sirio, | I | AVCODES |
| 2 | SIO | Sirio | | | ICAO1 |
| 3 | SIO | Siófok | City: Siófok | H | TRAFFIC |
| 4 | SIOA | SIORDIA MADRIGAL, LUIS ARMANDO | | | SCAC4 |
| 5 | SIOC | SSI OCEAN SERVICES INC | | | SCAC4 |
| 6 | SIOE | SIO, KEN S SEAFOOD | | | SCAC4 |
| 7 | SIOF | SCHRADER OIL CO | | | SCAC4 |
| 8 | SIOH | SINCLAIRE OIL & HEATING | | | SCAC4 |
| 9 | SIOK | SIMONS TRUCKING INC | | | SCAC4 |
| 10 | SIOL | SISSEL ONLINE LTD | | | SCAC4 |
| 11 | SION | SAGOVI CRUCES INTERNACIONALES | | | SCAC4 |
| 12 | SIOR | SUPERIOR BURNER SERVICE INC | | | SCAC4 |
| 13 | SIOS | S L I OF USA INC | | | SCAC4 |
| 14 | SIOT | SION TRANSPORT INC | | | SCAC4 |
| 15 | SIOU | AROS LINE AB | | | SCAC3 |
| 16 | SIOUX | Sioux City Transit | Real: SCT, City: Sioux City, IA | USA | TRAFFIC |
| 17 | SIOY | SHIPLEY OIL COMPANY | | | SCAC4 |
