| 1 | 9S | Southern Air, Inc. | ICAO: SOO, Callsign: Southern Air, IATA Prefix: 099, AOC merged into Atlas Air, Inc. (5Y/GTI) w.e.f. 17 November 2021. | USA | AVCODES |
| 2 | 9S | Slovak Airlines | ICAO: SLL, IATA designator changed to 6Q | SK | AVCODES |
| 3 | 9S | Sabourin Lake Airways Ltd. | | CDN | AVCODES |
| 4 | 9S | Blue Panorama Airlines S.p.A. | ICAO: BPA, Callsign: Blue Jet, IATA designator changed from 1I, then to BV | I | AVCODES |
| 5 | 9S | Spring Airlines Limited Corporation | ICAO: CQH, Callsign: Air Spring, IATA Prefix: 089, IATA designator changed to 9C. Designator 9S reinstated by IATA | PRC | AVCODES |
