Airline codes| IATA | ICAO | Airline | Call sign | Country | Comments |
|---|
| JTN | | JET TEST | United States | |
| JGJ | Jinggong Jet | GLOBAL JINGGONG | China | 2014, 2023 |
| JNY | Journey Aviation | ROCKBAND | United States | 2023: Callsign "ROCKBAND"; Former Call Sign/Telephony Designator: UNIJET-ROCKBAND (2014) |
| JKR | Justice Air Charter | JOKER | United States | Trading name for Reliant Aviation, allocated in 2014[1] |
| JWD | Jayawijaya Dirgantara | | Indonesia | |
| JCB | JCB (heavy equipment manufacturer) | JAYSEEBEE | United Kingdom | |
| RFX | J P Hunt Air Carriers | REFLEX | United States | J P Hunt Air Carriers |
| XM | | J-Air | J AIR | Japan | |
| JC | JEX | JAL Express | JANEX | Japan | |
| JO | JAZ | JALways | JALWAYS | Japan | |
| JDA | JDAviation | JAY DEE | United Kingdom | |
| JDP | JDP Lux | RED PELICAN | Luxembourg | |
| JHM | JHM Cargo Expreso | | Costa Rica | |
| TQM | JM Family Aviation | TACOMA | United States | |
| MT | JMC | JMC Airlines | JAYEMMSEE | United Kingdom | |
| 1M | | JSC Transport Automated Information Systems | | Russia | |
| JSJ | JS Air | JS CHARTER | Pakistan | |
| JES | JS Aviation | JAY-ESS AVIATION | Mexico | |
| JCK | Jackson Air Services | JACKSON | Canada | |
| JI | JAE | Jade Cargo International | JADE CARGO | China | defunct |
| JAW | Jamahiriya Airways | JAW | Libya | |
| JMB | Jambo Africa Airlines | JAMBOAFRICA | Democratic Republic of Congo | |
| WWW | Janet | JANET | United States | de facto name |
| FJX | Jet Sky Cargo and Air Charter | | Kenya | |
| JAK | Jana-Arka | YANZAR | Kazakhstan | |
| JAX | Janair | JANAIR | United States | |
| 3X | JAC | Japan Air Commuter | COMMUTER | Japan | |
| JSV | Japan Aircraft Service | | Japan | |
| JL | JAL | Japan Airlines | JAPANAIR | Japan | Japan Airlines International |
| JL | JAL | Japan Airlines Domestic | J-BIRD | Japan | defunct |
| EG | JAA | Japan Asia Airways | ASIA | Japan | defunct |
| NU | JTA | Japan Transocean Air | JAI OCEAN | Japan | |
| JA | JAT | JetSMART | ROCKSMART | Chile | |
| JZ | JAP | JetSMART Perú | RED SMART | Peru | |
| WJ | JES | JetSMART Argentina | SMARTBIRD | Argentina | |
| JU | JAT | Jat Airways | JAT | Serbia | |
| VJ | JTY | Jatayu Airlines | JATAYU | Indonesia | |
| J9 | JZR | Jazeera Airways | JAZEERA | Kuwait | |
| 7C | JJA | Jeju Air | JEJU AIR | Republic of Korea | |
| JNY | Jenney Beechcraft | JENAIR | United States | |
| XLD | Jeppesen Data Plan | | United States | |
| JPN | Jeppesen UK | JETPLAN | United Kingdom | |
| O2 | JEA | OLT Express | JETA | Poland | defunct, funded by acquisition of Jet Air and YES Airways |
| JSI | | SISTEMA | Russia | JSC |
| 9W | JAI | Jet Airways | JET AIRWAYS | India | |
| QJ | | Jet Airways | | United States | |
| JTX | Jet Aspen Air Lines | JET ASPEN | United States | |
| PP | PJS | Jet Aviation | JETAVIATION | Switzerland | |
| BZF | Jet Aviation Business Jets | BIZFLEET | United States | |
| JAS | Jet Aviation Flight Services | JET SETTER | United States | |
| JCF | Jet Center Flight Training | JET CENTER | Spain | |
| JCT | Jet Charter | JET CHARTER | United States | |
| JCX | Jet Connection | JET CONNECT | Germany | defunct |
| DWW | Jet Courier Service | DON JUAN | United States | |
| JED | Jet East International | JET EAST | United States | defunct |
| JEI | Jet Executive International Charter | JET EXECUTIVE | Germany | |
| RZA | Jet Fighter Flights | RAZOR | Australia | |
| CFT | Jet Freighters | CASPER FREIGHT | United States | |
| JGD | Jet G&D Aviation | JET GEE-AND-DEE | Israel | |
| MJL | Jet Line International | MOLDJET | Moldova | |
| JEK | Jet Link | JET OPS | Israel | |
| HTL | Jet Linx Aviation | HEARTLAND | United States | |
| JTL | Jet Linx Aviation | JET LINX | United States | |
| JNR | Jet Norte | JET NORTE | Mexico | |
| JRN | Jet Rent | JET RENT | Mexico | |
| JDI | Jet Story | JEDI | Poland | Formerly: Jet Service |
| 3K | JSA | Jetstar Asia Airways | JETSTAR ASIA | Singapore | |
| JDI | Jet Story | JEDI | Poland | former Blue Jet |
| JSM | Jet Stream | JET STREAM | Moldova | |
| VTB | Jet Stream Charter KFT. | SUXAIR | Hungary | 2023 |
| JSS | Jet Stream International | | Pakistan | 2023 |
| JTF | Jet Time | JETFIN | Finland | 2014,[2] 2023 |
| JTC | Jet Trans Aviation | JETRANS | Ghana | |
| JTT | Jet-2000 | MOSCOW JET | Russia | |
| OPS | Jet-Ops | OPS-JET | United Arab Emirates | |
| JSH | Jet-stream | STREAM AIR | Hungary | |
| LS | EXS | Jet2.com | CHANNEX | United Kingdom | Formerly Channel Express |
| JFU | Jet4You | ARGAN | Morocco | |
| OSW | JetAfrica Eswatini | BEVO | Eswatini | |
| B6 | JBU | JetBlue Airways | JETBLUE | United States | |
| JMG | JetMagic | JET MAGIC | Ireland | Defunct |
| JMK | Jetmagic | | Malta | Defunct, Not Many Flights |
| JF | JAA | Jet Asia Airways | JET ASIA | Thailand | |
| JAF | Jetairfly | BEAUTY | Belgium | |
| JTL | Jetall Holdings | FIREFLY | Canada | |
| JAG | Jetalliance | JETALLIANCE | Austria | |
| 0J | JCS | Jetclub | JETCLUB | Switzerland | |
| QNZ | Jetconnect | QANTAS JETCONNECT | New Zealand | |
| UEJ | | JETCORP | United States | (United Executive Jet) |
| JCC | Jetcraft Aviation | JETCRAFT | Australia | |
| JXA | Jetex Aviation | | Lebanon | |
| JEF | Jetflite | JETFLITE | Finland | |
| JFL | Jetfly Airlines | LINEFLYER | Austria | |
| JFA | Jetfly Aviation | MOSQUITO | Luxembourg | |
| JIC | Jetgo International | JIC-JET | Thailand | |
| JLX | Jetlink Express | KEN JET | Kenya | |
| JLH | Jetlink Holland | | Netherlands | Defunct, ICAO code in use by another company |
| JNL | JetNetherlands | JETNETHERLANDS | Netherlands | |
| JNV | Jetnova de Aviación Ejecutiva | JETNOVA | Spain | |
| JPO | Jetpro | JETPRO | Mexico | |
| MDJ | Jetran Air | JETRAN AIR | Romania | |
| JRI | Jetrider International | JETRIDER | United Kingdom | |
| JEJ | Jets Ejecutivos | MEXJETS | Mexico | |
| JEP | Jets Personales | JET PERSONALES | Spain | |
| JSE | Jets Y Servicios Ejecutivos | SERVIJETS | Mexico | |
| SG | JGO | JetsGo | JETSGO | Canada | defunct |
| JQ | JST | Jetstar | JETSTAR | Australia | |
| GK | JJP | Jetstar Japan | ORANGE LINER | Japan | |
| JM | JKT | Jetstar Hong Kong Airways | KAITAK | China | |
| JXT | Jetstream Executive Travel | VANNIN | United Kingdom | |
| RSP | JetSuite | REDSTRIPE | United States | |
| JPQ | Jett Paqueteria | JETT PAQUETERIA | Mexico | |
| JX | JEC | Jett8 Airlines Cargo | TAIPAN | Singapore | defunct |
| JO | JTD | Jettime | JETTIME | Denmark | |
| JTN | Jet Test Intl. | JET TEST | United States | |
| JWY | | JETWAYS | United States | |
| GX | JXX | JetX Airlines | JETBIRD | Iceland | |
| JIB | Jibair | JIBAIRLINE | Djibouti | |
| JSW | Jigsaw Project | JIGSAW | United Kingdom | Bristow Helicopters |
| HKN | Jim Hankins Air Service | HANKINS | United States | |
| RAS | Jim Ratliff Air Service | SHANHIL | United States | |
| LJ | JNA | Jin Air | JIN AIR | South Korea | |
| JDG | Joanas Avialinijos | LADYBLUE | Lithuania | |
| JBR | Job Air | JOBAIR | Czech Republic | |
| JHN | Johnson Air | AIR JOHNSON | United States | |
| JON | Johnsons Air | JOHNSONSAIR | Ghana | |
| JMJ | Johnston Airways | JOHNSTON | United States | |
| JMM | Joint Military Commission | JOICOMAR | Sudan | |
| JMT | Jomartaxi Aereo | JOMARTAXI | Mexico | |
| ODI | Jonsson, H Air Taxi | ODINN | Iceland | |
| R5 | JAV | Jordan Aviation | JORDAN AVIATION | Jordan | |
| J4 | JCI | Jordan International Air Cargo | | Jordan | |
| JVK | Jorvik | ISLANDIC | Iceland | |
| ENZ | Jota Aviation | ENZO | United Kingdom | |
| JNJ | Journey Jet | JOURNEY JET | Thailand | |
| XE | JSX | JSX (airline) | BIGSTRIPE | United States | |
| JUR | Ju-Air | JUNKERS | Switzerland | |
| JFS | Juanda Flying School | JAEMCO | Indonesia | |
| JUC | Juba Cargo Services & Aviation Company | JUBA CARGO | Sudan | |
| 6J | JUB | Jubba Airways | JUBBA | Somalia | |
| DKE | Jubilee Airways | DUKE | United Kingdom | |
| HO | DKH | Juneyao Airlines | AIR JUNEYAO | China | 2023[3] |
| JSY | Jung Sky | | Croatia | |
| MEY | Justair Scandinavia | MELODY | Sweden | |
| DOJ | Justice Prisoner and Alien Transportation System | JUSTICE | United States | | |
