| 1 | K9 | Skyward Aviation Ltd. | ICAO: SGK, Callsign: Skyward, Designator K9 reinstated by IATA | CDN | AVCODES |
| 2 | K9 | Krylo Airlines | ICAO: KRI, Callsign: Krilo, | RUS | AVCODES |
| 3 | K9 | Itapemirim Transportes Aereos S.A. | ICAO: ITM, IATA designator changed to 5W*. Branded as Itapemirim Cargo. | BR | AVCODES |
| 4 | K9 | Kalitta Charters LLC | ICAO: KFS, Callsign: Kalitta, | USA | AVCODES |
| 5 | K9 | Aircompany "Esen Air" | ICAO: ESD, Callsign: Esen Air, Founded in 2006. Ceased operations in 2008. | KS | AVCODES |
| 6 | K9 | Tonlesap Airlines | ICAO: TSP, Callsign: Tonlesap Air, IATA Prefix: 443, Founded in 2011. Ceased operations in 2013. | K | AVCODES |
| 7 | K9 | Krasavia, State Enterprise of Krasnoyarsk Territory | ICAO: SSJ, Callsign: Siberian Sky, Designator K9 recalled by IATA | RUS | AVCODES |
