| 1 | JK | Spanair, S.A. | ICAO: JKK, Callsign: Spanair, IATA Prefix: 680, Founded in 1986. Ceased operations on 27 January 2012. ICAO designator changed from SPP | E | AVCODES |
| 2 | JK | Spanair, S.A. | ICAO: SPP, Callsign: Sunwing, IATA Prefix: 680, ICAO designator changed to JKK / Callsign to Spanair | E | AVCODES |
| 3 | JK | Central Caribbean Air Ltd. | Callsign: Juliett Kilo, | AG | AVCODES |
| 4 | JK | Friendly Islands Airways Limited | ICAO: HRH, Callsign: Tonga Royal, | TO | AVCODES |
| 5 | JK | Aercaribe Aerolina del Caribe, S.A. | ICAO: ACL, Callsign: Admire, IATA Prefix: 543, Founded in 1997 | CO | AVCODES |
| 6 | JK | Jászkun Volán | | H | TRAFFIC |
| 7 | JK | Johannes Klinger GmbH u. Co. KG Heide | | DE | VKM |
| 8 | JKA | Letiurneau University, School of Aeronautical Science | Callsign: Jacket, | USA | AVCODES |
| 9 | JKAM | JOHNSON, KAMMY | | | SCAC4 |
| 10 | JKBK | JACK B TRUCKING | | | SCAC4 |
| 11 | JKBX | John Kenneth Burbridge | 7/2000-7/2005 (not listed) | | NAKINA |
| 12 | JKBX | John Kenneth Burbridge | Jul-00 | | NRHS |
| 13 | JKBX | JOHN KENNETH BURBRIDGE | | | PWRC |
| 14 | JKBX | John Kenneth Burbridge | | | RSRV |
| 15 | JKCA | JKC TRUCKING INC (OVER THE ROAD DIV | | | SCAC4 |
| 16 | JKCC | JHARNA-KALA CARD CO | | | SCAC4 |
| 17 | JKCE | JENKINS TRUCKING LLC | | | SCAC4 |
| 18 | JKCF | JKC TRUCKING INC | | | SCAC4 |
| 19 | JKCN | JKC ENTERPRISES INC | | | SCAC4 |
| 20 | JKCO | J & K SALVAGE | | | SCAC4 |
| 21 | JKCS | JOHNSON, K C & SONS INC | | | SCAC4 |
| 22 | JKCT | JKC TRANSPORT INC | | | SCAC4 |
| 23 | JKCX | Jarecki Chemical Co. | 7/1923 | | NAKINA |
| 24 | JKCX | JARECKI CHEMICAL CO. | | | PWRC |
| 25 | JKDG | JONES, RANDY TRUCKING | | | SCAC4 |
| 26 | JKDT | JOSKI, DENNIS TRUCKING LLC | | | SCAC4 |
| 27 | JKDU | CMLT CONTAINER MANAGEMENT GMBH | | | SCAC3 |
| 28 | JKDW | JACKSON DAWSON MOTORSPORTS INC | | | SCAC4 |
| 29 | JKEA | J & K EXPRESS INC | | | SCAC4 |
| 30 | JKEC | JONES TRUCK BROKERS | | | SCAC4 |
| 31 | JKEG | JACKSON ENERGY LLC | | | SCAC4 |
| 32 | JKEL | JORDAN, KC ENTERPRISE LLC | | | SCAC4 |
| 33 | JKEN | HG JENKINS CONSTRUCTION INC | | | SCAC4 |
| 34 | JKEO | JK & E TRANSPORT LLC | | | SCAC4 |
| 35 | JKEQ | JKB ENTERPRISES TRANSPORTATION LLC | | | SCAC4 |
| 36 | JKEV | JEWELL, KIRK EXCAVATING | | | SCAC4 |
| 37 | JKFC | JACKSON FUEL CORP | | | SCAC4 |
| 38 | JKFF | JackRabbit Fast Freight Corp [1] | | | SCAC2 |
| 39 | JKFF | JACKRABBIT FAST FREIGHT CORP | | | SCAC4 |
| 40 | JKFH | J K FAST FREIGHT | | | SCAC4 |
| 41 | JKFK | JAKES FIREWORKS INC | | | SCAC4 |
| 42 | JKFM | JACKSONS FARMING CO OF AUTRYVILLE | | | SCAC4 |
| 43 | JKFS | JK FARMS & TRUCKING INC | | | SCAC4 |
| 44 | JKFT | J K FUEL TRANSPORTER INC | | | SCAC4 |
| 45 | JKG | Air Jet | Callsign: Frunze, | KZ | AVCODES |
| 46 | JKGA | JACKSON, GARY TRANSPORTATION LTD | | | SCAC4 |
| 47 | JKGL | JOANNS TRUCKING LLC | | | SCAC4 |
| 48 | JKGR | J & K GROWERS | | | SCAC4 |
| 49 | JKH | JK Jetkontor AG | Callsign: Jetkontor, | D | AVCODES |
| 50 | JKJN | JKJ TRUCKING | | | SCAC4 |
| 51 | JKJR | JACK JR EXPRESS INC | | | SCAC4 |
| 52 | JKK | Spanair, S.A. | IATA: JK, Callsign: Spanair, IATA Prefix: 680, Founded in 1986. Ceased operations on 27 January 2012. ICAO designator changed from SPP | E | AVCODES |
| 53 | JKK | Spanair | IATA: JK | | ICAO1 |
| 54 | JKK | Spanair | | E | TRAFFIC |
| 55 | JKKT | JACKS TRUCKING | | | SCAC4 |
| 56 | JKL | J.K. Line, Inc. | 1/1994-7/2005 | | NAKINA |
| 57 | JKL | J.K. Line, Inc. | 1/94-7/2000 | | NRHS |
| 58 | JKL | J. K. LINE, INC. | | | PWRC |
| 59 | JKL | J.K. Line | | | RSRV |
| 60 | JKL | J K LINE INC | | | SCAC4 |
| 61 | JKL | Jan Klein | | D | TRAFFIC |
| 62 | JKLC | JK LOGISTICS LLC | | | SCAC4 |
| 63 | JKLI | JONICK- LOPEZ INTERNATIONAL TRANSPO | | | SCAC4 |
| 64 | JKLL | JKL TRANSPORTATION LLC | | | SCAC4 |
| 65 | JKLM | JK LOGISTICS LLC | | | SCAC4 |
| 66 | JKLO | JOHNSON, KEN LOGISTICS LLC | | | SCAC4 |
| 67 | JKLT | J & K LOBSTER BAIT INC | | | SCAC4 |
| 68 | JKMD | JKM DAVIS TRANSPORTATION LLC | | | SCAC4 |
| 69 | JKMK | JENKINS, MARIO TRUCKING INC | | | SCAC4 |
| 70 | JKML | JACKMAN LUMBER | | | SCAC4 |
| 71 | JKMS | JK MOVING & STORAGE INC | | | SCAC4 |
| 72 | JKMT | JONKMAN EQUIPMENT LTD | | | SCAC4 |
| 73 | JKMW | JK MARITIME CO LTD | | | SCAC4 |
| 74 | JKN | KSA Charters Ltd. d/b/a Junkanoo Air | Callsign: Junkanoo Air, | BS | AVCODES |
| 75 | JKNB | JACK IN THE BOX INC | | | SCAC4 |
| 76 | JKND | JACKSON & SON DISTRIBUTORS INC | | | SCAC4 |
| 77 | JKNG | J & A TRUCKING INC | | | SCAC4 |
| 78 | JKNL | JAS-KIRAN TRUCKING LTD | | | SCAC4 |
| 79 | JKNP | J & K TRANSPORT | | | SCAC4 |
| 80 | JKOB | JACKS OIL DISTRIBUTING | | | SCAC4 |
| 81 | JKOC | JACKSON OIL COMPANY | | | SCAC4 |
| 82 | JKOD | JACKSON, ODIE TRUCKING INC | | | SCAC4 |
| 83 | JKOI | JACKSON OIL | | | SCAC4 |
| 84 | JKOY | Pääkaupunkiseudun Junakalusto Oy | | FI | VKM |
| 85 | JKPY | JK PLAYER SPORTS | | | SCAC4 |
| 86 | JKR | Empire Airways | Callsign: Joker, Established in 2004. Ceased operations in 2012. Wholly owned by Partner Aviation Enterprises. | USA | AVCODES |
| 87 | JKR | Reliant Aviation d/b/a Justice Air Charter | Callsign: Joker, Name changed to Justice Air Charter. | USA | AVCODES |
| 88 | JKR | Justice Air Charter | Callsign: Joker, Name changed to Justice Air, Inc. Name changed from Reliant Aviation d/b/a Justice Air Charter. | USA | AVCODES |
| 89 | JKR | Justice Air, Inc. | Callsign: Joker, Name changed from Justice Air Charter. Name changed from Reliant Aviation d/b/a Justice Air Charter. | USA | AVCODES |
| 90 | JKRO | JOHNSON, KARL R TRUCKING INC | | | SCAC4 |
| 91 | JKRS | J K TRANSPORT INC | | | SCAC4 |
| 92 | JKSB | JACKS BAIT DISTRIBUTORS | | | SCAC4 |
| 93 | JKSC | JAKAIT EXPRESS INC | | | SCAC4 |
| 94 | JKSE | JACKSON, SAMMY ENTERPRISES INC | | | SCAC4 |
| 95 | JKSI | JACKSON TRUCKING COMPANY INC | | | SCAC4 |
| 96 | JKSL | JACKSON ENTERPRISES LLC | | | SCAC4 |
| 97 | JKSM | JKS MOTORSPORTS OPERATIONS LLC | | | SCAC4 |
| 98 | JKSO | JACKS TOWING | | | SCAC4 |
| 99 | JKSR | JK TRANSPORT EXPRESS INC | | | SCAC4 |
| 100 | JKSV | J & KS SERVICE LLC | | | SCAC4 |
