| 1 | JX | Nice Helicopteres | Designator JX* recalled by IATA | F | AVCODES |
| 2 | JX | KAL Aviation S.A. d/b/a Skybus | Designator JX* recalled by IATA | GR | AVCODES |
| 3 | JX | Jett8 Airlines Cargo Pte Ltd | ICAO: JEC, Callsign: Taipan, IATA Prefix: 693, AOC revoked by CAAS on 01 August 2012. | SGP | AVCODES |
| 4 | JX | Jambojet Limited | Low-cost subsidiary of Kenya Airways. Founded on 13 September 2013. Commenced operations on 01 April 2014. Their Twitter account quotes IATA Code JX. Website uses KQ of Kenya Airways | EAK | AVCODES |
| 5 | JX | DAC Aviation (EC) Ltd. | IATA Designator changed from J5* | EAK | AVCODES |
| 6 | JXA | Jetex Aviation | | RL | AVCODES |
| 7 | JXA | Jetex Aviation | | | ICAO1 |
| 8 | JXCP | JAM XPRESS CORP | | | SCAC4 |
| 9 | JXGB | JONES EXPRESS INC (GOVERNMENT DIV B | | | SCAC4 |
| 10 | JXGC | JONES EXPRESS INC (GOVERNMENT DIV C | | | SCAC4 |
| 11 | JXJU | GOLD STAR LINE LTD | | HK | BIC |
| 12 | JXJU | GOLD STAR LINE LIMITED | | | SCAC4 |
| 13 | JXLD | JAYARAM XPRESS LTD | | | SCAC4 |
| 14 | JXLL | JT EXPRESS LLC | | | SCAC4 |
| 15 | JXLR | J X L RANCH | | | SCAC4 |
| 16 | JXLU | GOLD STAR LINE LTD | | HK | BIC |
| 17 | JXLU | GOLD STAR LINE LIMITED | | | SCAC4 |
| 18 | JXNT | JXN TRANSPORT | | | SCAC4 |
| 19 | JXPC | JAMA TRANSPORT LLC | | | SCAC4 |
| 20 | JXPI | J O EXPRESS & TRANSPORT INC | | | SCAC4 |
| 21 | JXPK | JULIAN XPRESS | | | SCAC4 |
| 22 | JXPL | JACKSON EXPRESS LLC | | | SCAC4 |
| 23 | JXPN | JUSTIN TRANSPORT INC | | | SCAC4 |
| 24 | JXPT | Jaxport Terminal Ry. Co. | added 1/1990; 1/1994; eliminated 10/1997 | | NAKINA |
| 25 | JXPT | Jaxport Terminal Ry. Co. | added 1/90; 1/94; eliminated 10/97 | | NRHS |
| 26 | JXPT | JAXPORT TERMINAL RAILWAY COMPANY (OUT OF EXISTENCE) | | | PWRC |
| 27 | JXSG | JIANG, XIAO SONG | | | SCAC4 |
| 28 | JXT | Jetstream Executive Travel Ltd. | | GB | AVCODES |
| 29 | JXT | Jetstream Executive Travel | | | ICAO1 |
| 30 | JXTL | JET TRANSIT LLC | | | SCAC4 |
| 31 | JXTR | JAXTRUCKING INC | | | SCAC4 |
| 32 | JXX | Jet X | | I | AVCODES |
| 33 | JXX | JetX Airlines | IATA: GX, Callsign: Jetbird, IATA Prefix: 591, Name changed to JetX ehf (Primera Air) | IS | AVCODES |
| 34 | JXX | JetX ehf, (Primera Air) | IATA: GX, Callsign: Jetbird, IATA Prefix: 591, Name changed to Primera Air ehf (Jetx). Name changed from JetX Limited | IS | AVCODES |
| 35 | JXX | Primera Air ehf (Jetx) | IATA: GX, Callsign: Jetbird, IATA Prefix: 591, Designator GX recalled by IATA. Name changed from JetX ehf, (Primera Air) | IS | AVCODES |
| 36 | JXX | Jinxiang Airlines | Callsign: Coconut, | PRC | AVCODES |
| 37 | JXX | Jetx Airlines | IATA: GX | | ICAO1 |
| 38 | JXXT | JONES READY MIX LLC | | | SCAC4 |
