| 1 | OSO | Artidoro Leal Cauntes (Aerosorno) | Callsign: Aerosorno, | RCH | AVCODES |
| 2 | OSO | Aviapartner Limited Company | | RUS | AVCODES |
| 3 | OSO | Aviapartner Limited Company | | | ICAO1 |
| 4 | OSO | Ocilla Southern R.R. Co. | 7/1923 | | NAKINA |
| 5 | OSO | OCILLA SOUTHERN RAILROAD CO. | | | PWRC |
| 6 | OSOC | ORLAND SOIL CONTRACTORS INC | | | SCAC3 |
| 7 | OSOC | OSO EXPRESS CORP | | | SCAC4 |
| 8 | OSOF | ONE SIX ONE FOUR SIX FOUR (161464) | | | SCAC4 |
| 9 | OSOI | ONE STOP OIL CO INC | | | SCAC3 |
| 10 | OSOR | OSOW TRANSPORTATION LLC | | | SCAC4 |
| 11 | OSOT | OLD SOUTH TRANSPORTATION MANAGEMENT | | | SCAC3 |
| 12 | OSOW | ONE SIX ONE TWO FIVE TWO TWO (16125 | | | SCAC4 |
