| 1801 | JKXL | JENKEN TRANSPORT LLC | | | SCAC4 |
| 1802 | JKXT | JK EXPRESS TRANSPORT INC | | | SCAC4 |
| 1803 | JKY | Helicopter & Aviation Services Ltd. | Callsign: Jockey, Special Events Heliport Management | GB | AVCODES |
| 1804 | JKY | Helicopter & Aviation Services | | | ICAO1 |
| 1805 | JKZ | Jet One JSC | Callsign: Jetal, | KZ | AVCODES |
| 1806 | JL | Japan Airlines Company Ltd. | ICAO: JAL, Callsign: Japanair, IATA Prefix: 131, Name changed from Japan Air Lines Company Ltd. Then changed to Japan Airlines International Co. Ltd. | J | AVCODES |
| 1807 | JL | Japan Air Lines Company Ltd. (JAL) | ICAO: JAL, Callsign: Japanair, IATA Prefix: 131, Name changed to Japan Airlines Company Ltd. | J | AVCODES |
| 1808 | JL | Japan Airlines International Co. Ltd. | ICAO: JAL, Callsign: Japanair, IATA Prefix: 131, Name changed from Japan Airlines Company Ltd w.e.f. 31 March 2004. | J | AVCODES |
| 1809 | JL | Jet Linx Aviation, LLC | ICAO: JTL, Callsign: Jet Linx, | USA | AVCODES |
| 1810 | JL | *JAPAN LINE, LTD | | | PWRC |
| 1811 | JL | *JONES & LAUGHLIN STEEL | | | PWRC |
| 1812 | JL | JEFFERSON LINES | | | SCAC4 |
| 1813 | JLA | Mia Airlines | Callsign: Salline, Ceased operations. | RO | AVCODES |
| 1814 | JLA | Aero JL S.A. de C.V. | Callsign: Aero Joe, | MEX | AVCODES |
| 1815 | JLA | MIA Airlines | | | ICAO1 |
| 1816 | JLA | Jarocińskie Linie Autobusowe | City: Jarocin | PL | TRAFFIC |
| 1817 | JLAA | JLV TRANSPORTATION LLC | | | SCAC4 |
| 1818 | JLAC | JET LINE AIR CARGO | | | SCAC4 |
| 1819 | JLAF | JL EXPRESS SA DE CV | | | SCAC4 |
| 1820 | JLAH | JAPAN LINE, LTD | | | PWRC |
| 1821 | JLAI | J L TRANSPORT OF HELENVILLE INC | | | SCAC4 |
| 1822 | JLAL | JLA TRUCKING LLC | | | SCAC4 |
| 1823 | JLAM | J LIM TRUCKING CORP | | | SCAC4 |
| 1824 | JLAT | J-LAURITZEN (USA) INC | | | SCAC4 |
| 1825 | JLAU | JAPAN LINE, LTD. | | | PWRC |
| 1826 | JLAU | Japan Line | | | RSRV |
| 1827 | JLAW | J-LAW TRANSPORT INC | | | SCAC4 |
| 1828 | JLB | Jhonlin Air Transport, PT. | Callsign: Jhonlin, | RI | AVCODES |
| 1829 | JLBA | JLB TRANSPORTATION INC | | | SCAC4 |
| 1830 | JLBB | J L B TRUCKING LLC | | | SCAC4 |
| 1831 | JLBC | JLB TRANSFER COMPANY | | | SCAC1 |
| 1832 | JLBC | JAGUAR LOGISTICAL TRANSPORTATION | | | SCAC4 |
| 1833 | JLBI | JLA TRANSPORT INC | | | SCAC4 |
| 1834 | JLBK | JL BROKERS | | | SCAC4 |
| 1835 | JLBN | JLB TRUCKING COMPANY INC | | | SCAC4 |
| 1836 | JLBQ | J & B WHOLESALE DISTRIBUTING INC | | | SCAC4 |
| 1837 | JLC | Angelic Air LLC | Callsign: Angelic, | USA | AVCODES |
| 1838 | JLCG | JULRIC LOGISTICS LLC | | | SCAC4 |
| 1839 | JLCL | JLC LOGISTICS | | | SCAC4 |
| 1840 | JLCO | JACOBSON LOGISTICS COMPANY LLC (A D | | | SCAC4 |
| 1841 | JLCP | JLC INTERNATIONAL SEAFOOD CORP | | | SCAC4 |
| 1842 | JLCS | JILLION CORPORATION | | | SCAC4 |
| 1843 | JLCU | HAMBURG SUED | | | SCAC4 |
| 1844 | JLCX | Jackson Lumber Co. | 7/1923-7/1930 | | NAKINA |
| 1845 | JLCX | *JACKSON LUMBER CO. | | | PWRC |
| 1846 | JLCX | +564109 B.C., LTD. | | | PWRC |
| 1847 | JLCX | FIVE SIX FOUR ONE ZERO NINE (564109 | | | SCAC4 |
| 1848 | JLDU | SAS DELISLE JEAN-LOUIS | | F | BIC |
| 1849 | JLDU | JAPAN LINE, LTD | | | PWRC |
| 1850 | JLDU | Japan Line | | | RSRV |
| 1851 | JLE | Jetline, Inc. | Callsign: Equajet, | GQ | AVCODES |
| 1852 | JLEA | JIMS LEASING INC | | | SCAC4 |
| 1853 | JLEI | JENNINGS, LEE, ENTERPRIZES, INC | | | SCAC1 |
| 1854 | JLEI | JENNINGS, LEE TARGET EXPRESS INC | | | SCAC4 |
| 1855 | JLEK | J L E TRUCKING LLC | | | SCAC4 |
| 1856 | JLET | JOHNSON, L E TRANSPORT LLC | | | SCAC4 |
| 1857 | JLEU | JAPAN LINE, LTD | | | PWRC |
| 1858 | JLEU | Japan Line | | | RSRV |
| 1859 | JLEZ | JAPAN LINE, LTD | | | PWRC |
| 1860 | JLEZ | Japan Line | | | RSRV |
| 1861 | JLF | Jetline Fluggesellschaft mbH & Co. KG | Callsign: Cavallo, On 2 March 2010, the District Court of Esslingen opened bankruptcy proceedings. | D | AVCODES |
| 1862 | JLF | International Air Charters, Inc. | Callsign: Jetlyft, | USA | AVCODES |
| 1863 | JLFB | J & L FREIGHT BROKERAGE LLC | | | SCAC4 |
| 1864 | JLFC | J & L FABRICATING | | | SCAC4 |
| 1865 | JLFG | JONES, LEON FEED & GRAIN INC | | | SCAC4 |
| 1866 | JLFH | JL FREIGHT | | | SCAC4 |
| 1867 | JLG | Jet Logistics, Inc. | Callsign: Logistics, | USA | AVCODES |
| 1868 | JLGD | JT LEGEND TRUCKING INC | | | SCAC4 |
| 1869 | JLGU | JLG CONTAINER SERVICES CO., LIMITED | | HK | BIC |
| 1870 | JLH | Jetlink Holland | Founded in 1991. Declared bankrupt in June 2000. | NL | AVCODES |
| 1871 | JLH | Jet Link Cargo Airline | IATA Prefix: 712, Ceased operations in 2015. | NL | AVCODES |
| 1872 | JLH | Centro de Servicio Aeronautico, S.A. de C.V. | Callsign: Cesa, | MEX | AVCODES |
| 1873 | JLH | Jetlink Holland | | | ICAO1 |
| 1874 | JLHU | JAPAN LINE, LTD. | | | PWRC |
| 1875 | JLHU | Japan Line | | | RSRV |
| 1876 | JLHX | Jake L. Hamon | 8/1920 | | NAKINA |
| 1877 | JLHX | Estate of Jake L. Hamon | 7/1923 | | NAKINA |
| 1878 | JLHX | JAKE L. HARMON ESTATE | | | PWRC |
| 1879 | JLIB | JLC LOGISTICS INC | | | SCAC4 |
| 1880 | JLID | JEWEL LIMITED | | | SCAC4 |
| 1881 | JLIE | JLI TRANSPORTATION INC | | | SCAC4 |
| 1882 | JLIF | JLS LOGISTICS INC | | | SCAC4 |
| 1883 | JLIG | JOHAL LOGISTICS INC | | | SCAC4 |
| 1884 | JLII | J L | | | SCAC4 |
| 1885 | JLIK | JERKE LIVESTOCK INC | | | SCAC4 |
| 1886 | JLIL | J & L INTERNATIONAL LLC | | | SCAC4 |
| 1887 | JLIN | JOLIN, BERNARD | | | SCAC4 |
| 1888 | JLIO | JARTIE LOGISTICS INC | | | SCAC4 |
| 1889 | JLIP | JERICHO LOGISTICS INCORPORATED | | | SCAC4 |
| 1890 | JLIQ | JERICHO LOGISTICS INC | | | SCAC4 |
| 1891 | JLIR | JAS LOGISTICS INC | | | SCAC4 |
| 1892 | JLIT | JETX LOGISTICS INC | | | SCAC4 |
| 1893 | JLIU | JOSEF LINDBERG SANDARNE AB | | S | BIC |
| 1894 | JLIU | JOSEF LINDBERG SANDARNE AB | | | SCAC4 |
| 1895 | JLIW | JTI LOGISTICS INC | | | SCAC4 |
| 1896 | JLIY | JACKY LINES INC | | | SCAC4 |
| 1897 | JLJ | Japan Airlines Domestic Co. Ltd. | Callsign: J-Bird, | J | AVCODES |
| 1898 | JLJ | Noble Air Charter | Callsign: Highborn, | USA | AVCODES |
| 1899 | JLJ | Johannisberg - Ljungaverk Järnväg | 1912 - | S | svenska-lok.se |
| 1900 | JLJ | Japan Airlines Domestic Co. Ltd. | | J | TRAFFIC |
