| 1 | J4 | Buffalo Airways Ltd. | ICAO: BFL, Callsign: Buffalo, Designator J4* recalled by IATA | CDN | AVCODES |
| 2 | J4 | Air Jamaica Express Limited | ICAO: JMX, Commenced operations on 18 April 1996. IATA Designator changed to JQ. | JA | AVCODES |
| 3 | J4 | Jordan International Air Cargo Company (JIAC) | ICAO: JCI, IATA Prefix: 660, | JOR | AVCODES |
| 4 | J4 | Jet Time A/S | ICAO: JTG, Callsign: Jettime, Commenced operations on 19 September 2006. Filed for bankruptcy on 21 July 2020. | DK | AVCODES |
| 5 | J4 | Badr Airlines | ICAO: BDR, Callsign: Badr Air, IATA Prefix: 367, | SUD | AVCODES |
