| 1 | S6 | Mountain Bird, Inc. d/b/a Salmon Air | | USA | AVCODES |
| 2 | S6 | SAE SWE Aviation Europe AB | IATA designator changed to S9* | S | AVCODES |
| 3 | S6 | Air St. Martin | Designator recalled by IATA | GP | AVCODES |
| 4 | S6 | SiFly Compagnia Aerea | ICAO: KWY, Callsign: Sifly, Designator S6 recalled by IATA | I | AVCODES |
| 5 | S6 | SiFly Compagnia Aerea | ICAO: KWY, Callsign: Sifly, Ceased operations on 06 October 2001. Designator S6 reinstated by IATA | I | AVCODES |
| 6 | S6 | Star Air A/S | ICAO: SRR, Callsign: Whitestar, IATA designator changed to DJ*. | DK | AVCODES |
| 7 | S6 | Sun Air Co. | ICAO: SNR, Callsign: Sun Group, Designator S6 recalled by IATA. | SUD | AVCODES |
| 8 | S6 | McCall Aviation, Inc. | ICAO: MKL, Callsign: Mccall, | USA | AVCODES |
| 9 | S6 | Sunrise Airways S.A. | ICAO: KSZ, | RH | AVCODES |
