| 1 | JU | Jugoslovenski Aerotransport (JAT) | ICAO: JAT, Callsign: JAT, IATA Prefix: 115, Name changed to Jat Airways | YU | AVCODES |
| 2 | JU | Jat Airways | ICAO: JAT, Callsign: JAT, IATA Prefix: 115, Name changed from Jugoslovenski Aerotransport (JAT) | SCG | AVCODES |
| 3 | JU | Jat Airways | ICAO: JAT, Callsign: JAT, IATA Prefix: 115, ICAO Callsign changed to Air Serbia. Name changed from Jugoslovenski Aerotransport (JAT) | SR | AVCODES |
| 4 | JU | Jat Airways | ICAO: JAT, Callsign: Air Serbia, IATA Prefix: 115, ICAO Callsign changed from JAT. Name changed from Jugoslovenski Aerotransport (JAT) | SR | AVCODES |
| 5 | JU | JSC for Air Traffic-Air SERBIA Belgrade t/a Air Serbia a.d. Beograd | ICAO: ASL, Callsign: Air Serbia, IATA Prefix: 115, Name changed from Jat Airways. ICAO Designator changed from JAT. Name changed from Jugoslovenski Aerotransport (JAT) | SR | AVCODES |
| 6 | JU | Jet Up Aviation, LLC | | USA | AVCODES |
| 7 | JUA | Aero Juarez, S.A. de C.V. | Callsign: Juarez, | MEX | AVCODES |
| 8 | JUA | Jupiter Airlines Limited | Callsign: Jupiter Gambia, | WAG | AVCODES |
| 9 | JUA | Aero Juarez | | | ICAO1 |
| 10 | JUAE | JUANITOS EXPRESS | | | SCAC4 |
| 11 | JUAS | JUAN & SONS TRUCKING | | | SCAC4 |
| 12 | JUB | Jubba Airways Limited d/b/a Jubba Airways | IATA: 3O, Callsign: Jubba, IATA designator changed to 6J | SO | AVCODES |
| 13 | JUB | Jubba Airways Limited d/b/a Jubba Airways | IATA: 3J, Callsign: Jubba, IATA Prefix: 535, IATA designator changed from 3O* | SO | AVCODES |
| 14 | JUB | Jubba Airways | | | ICAO1 |
| 15 | JUBA | JUBA LINK TRUCKING INC | | | SCAC4 |
| 16 | JUBM | JUBILEE MATERIALS, INC | | | SCAC1 |
| 17 | JUC | Juba Cargo Services & Aviation Co. Ltd. | Callsign: Juba Cargo, | SUD | AVCODES |
| 18 | JUC | Juba Cargo Services & Aviation Company | | | ICAO1 |
| 19 | JUD | US Department Of Justice Prisoner & Alien Transportation Service (JPATS) | Callsign: Justice, ICAO Designator changed to DOJ | USA | AVCODES |
| 20 | JUD | JOLIET UNION DEPOT | | | PWRC |
| 21 | JUDD | JUDD, RAY PETROLEUM | | | SCAC4 |
| 22 | JUDG | JUDGE, P | | | SCAC4 |
| 23 | JUDT | JUDAH TRANSPORT LLC | | | SCAC4 |
| 24 | JUDY | JUDYS BROKERAGE COMPANY | | | SCAC4 |
| 25 | JUET | JUETTNER TRUCKING SERVICE INC | | | SCAC4 |
| 26 | JUFL | JUST FUEL INC | | | SCAC4 |
| 27 | JUGO | JUGOSLAVENSKA TANKERSKA PLOVIDBA, Z | | | SCAC4 |
| 28 | JUGU | JOGOLINJA | | | PWRC |
| 29 | JUGU | Jogolinja | | | RSRV |
| 30 | JUGU | JUGELINIJA-PRODUZECE ZA MADJUNARODN | | | SCAC4 |
| 31 | JUHU | BSH HAUSGERATE GMBH | | D | BIC |
| 32 | JUIST | Inselbahn Juist | | D | TRAFFIC |
| 33 | JUJL | JUJ LOGISTICS LTD | | | SCAC4 |
| 34 | JUKG | JZ TRUCKING | | | SCAC4 |
| 35 | JULA | Jula AB | | SE | VKM |
| 36 | JULE | JULE ENTERPRISES | | | SCAC4 |
| 37 | JULO | JULIEN OIL COMPANY | | | SCAC4 |
| 38 | JULY | JULY EXPRESS LTD | | | SCAC4 |
| 39 | JUM | Jump Aviation, S.L. | | E | AVCODES |
| 40 | JUMA | Junior market s.r.o. | | CZ | VKM |
| 41 | JUMB | JUMBO SHIPPING V O F | | | SCAC4 |
| 42 | JUMBO | Jumbotec | | D | TRAFFIC |
| 43 | JUMP | JUMP LOGISTICS INC | | | SCAC4 |
| 44 | JUMT | JUMP TRANSPORT LLC | | | SCAC4 |
| 45 | JUNG | JUNG EXPRESS | | | SCAC4 |
| 46 | JUNI | JUNG OIL INCORPORATED | | | SCAC4 |
| 47 | JUNL | JUNG LOGISTICS INC | | | SCAC4 |
| 48 | JUNP | JUNIOR EXPRESS INC | | | SCAC4 |
| 49 | JUNS | JUNS TRANSPORT LLC | | | SCAC4 |
| 50 | JUP | UAB Jump Air | Callsign: Jump Air, AOC received on 31 December 2021. | LT | AVCODES |
| 51 | JUPF | JUNIPER FUEL INC | | | SCAC4 |
| 52 | JUR | Ju-Air | Callsign: Junkers, | CH | AVCODES |
| 53 | JUR | Ju-Air | | | ICAO1 |
| 54 | JURA | J-UST R-UN TRUCKING LLC | | | SCAC4 |
| 55 | JURU | KRAUS GMBH | | D | BIC |
| 56 | JURU | JURI KRAUS | | | SCAC4 |
| 57 | JURW | Junee Railway Workshop | Real: JRW | AUS | TRAFFIC |
| 58 | JUS | USA Jet Airlines, Inc. | IATA: U7, Callsign: Jet USA, Designator U7 recalled by IATA | USA | AVCODES |
| 59 | JUS | USA Jet Airlines, Inc. | IATA: 0O, IATA designator changed to U7 | USA | AVCODES |
| 60 | JUS | USA Jet Airlines, Inc. | IATA: UJ, Callsign: Jet USA, Designator U7 recalled by IATA | USA | AVCODES |
| 61 | JUS | USA Jet Airlines, Inc. | IATA: UJ, Callsign: Jet USA, Designator U7 recalled by IATA | USA | AVCODES |
| 62 | JUS | USA Jet Airlines | IATA: U7 | | ICAO1 |
| 63 | JUSE | JUSTIFIABLE ENTERPRISE INC | | | SCAC4 |
| 64 | JUSF | JUSTA FREIGHT COMPANY INC | | | SCAC4 |
| 65 | JUSJ | JUST JOHN TRUCKING CORP | | | SCAC4 |
| 66 | JUSN | JUSTIN TRANSPORT INC | | | SCAC4 |
| 67 | JUSO | JUST OIL | | | SCAC4 |
| 68 | JUSO | JUSO s.r.o. | | SK | VKM |
| 69 | JUSR | JUST LOGISTIC LLC | | | SCAC4 |
| 70 | JUST | JUSTUS | | | SCAC4 |
| 71 | JUST | Japan Universal System Transport | Real: JST | J | TRAFFIC |
| 72 | JUST | Stauffer, Schienen- und Spezialfahrzeuge, Frauenfeld | | CH | VKM |
| 73 | JUSY | JUTTA UNIVERSAL SYSTEMS INC | | | SCAC4 |
| 74 | JUT | Jutland Jets Air Taxi A/S | Callsign: Jutland, | DK | AVCODES |
| 75 | JUTA | JUTTA TRANSPORTATION SERVICES | | | SCAC4 |
| 76 | JUTI | JUBILEE TRANSPORTATION INC | | | SCAC4 |
| 77 | JUTK | JUMAN TRUCKING SERVICES | | | SCAC4 |
| 78 | JUTL | JUSTUS TRUCK LINES INC | | | SCAC4 |
| 79 | JUTM | JUSTIN TIME INC | | | SCAC4 |
| 80 | JUTP | JULDOR TRANSPORT INC | | | SCAC4 |
| 81 | JUTT | JUSTA LLC | | | SCAC4 |
| 82 | JUTV | JMS INTERNATIONAL TRANSPORT & FOREI | | | SCAC4 |
| 83 | JUV | Jaeger Umwelt + Verkehr GmbH + Co KG | | DE | VKM |
