| 1801 | LDLX | Liquids Despatch Line, Inc. (General American Tank Car Corp.) | 7/1935 | | NAKINA |
| 1802 | LDLX | Liquids Despatch Line, Inc. | 7/1930-7/1932 | | NAKINA |
| 1803 | LDLX | Liquids Despatch Line | 8/1920-7/1923 | | NAKINA |
| 1804 | LDLX | Liquids Despatch Line (General American Transporation Corp.) | Apr-38 | | NRHS |
| 1805 | LDLX | GENERAL AMERICAN TRANSPORTATION CORP. (LIQUIDS DESPATCH LINE, INC.) | | | PWRC |
| 1806 | LDM | LaudaMotion GmbH | Callsign: Expert, Name changed to LaudaMotion Executive GmbH. ICAO designator changed to LDX. Name changed from Amira Air GmbH during December 2015 after change of ownership. ICAO Desginator changed from XPE. | A | AVCODES |
| 1807 | LDM | LaudaMotion GmbH | IATA: OE, Callsign: Expert, Ceased operations on 31 October 2020 as operations transferred to Lauda Europe. Prevoiusly Niki. Sold to LaudaMotion on 23 January 2018. | A | AVCODES |
| 1808 | LDMA | LANDMARK TRANSPORT INC | | | SCAC3 |
| 1809 | LDMC | LAKELAND MOTOR COURIERS INC | | | SCAC3 |
| 1810 | LDMD | LDM TRUCKING LLC | | | SCAC4 |
| 1811 | LDME | LOADMASTERS EXPRESS LLC | | | SCAC4 |
| 1812 | LDMK | LANDMARK DESIGNS INTERNATIONAL | | | SCAC3 |
| 1813 | LDMK | LDM CONTRACT CARRIERS | | | SCAC4 |
| 1814 | LDMM | LDM MOVING SERVICE | | | SCAC3 |
| 1815 | LDMN | LAND MARINE S A | | | SCAC4 |
| 1816 | LDMO | LANDRY AND MARTIN OIL CO INC | | | SCAC4 |
| 1817 | LDMS | LOADMASTERS INTERNATIONAL TRANSPORT | | | SCAC3 |
| 1818 | LDMT | L D M TRANSPORT INC | | | SCAC3 |
| 1819 | LDMT | L D M TRANSPORT INC | | | SCAC4 |
| 1820 | LDMV | LEMMERMAN, DICK MOVING CO | | | SCAC3 |
| 1821 | LDMX | LDM Yorkton Trading LP | added 4/2009 | | NAKINA |
| 1822 | LDMX | LDM YORKTON TRADING LP | | | SCAC4 |
| 1823 | LDMY | LANDIS MYER TRANSPORTATION | | | SCAC3 |
| 1824 | LDN | Al-Donas Airlines Ltd. | Callsign: Aldonas Air, | WAN | AVCODES |
| 1825 | LDN | Al-Donas Airlines | | | ICAO1 |
| 1826 | LDNA | LUNDSTROM, DONALD A | | | SCAC3 |
| 1827 | LDNB | LINDEN BULK TRANSPORTATION SW LLC | | | SCAC4 |
| 1828 | LDNK | LEMAN, DALE & SONS TRUCKING | | | SCAC3 |
| 1829 | LDNM | LADEN MARITIME INC | | | SCAC4 |
| 1830 | LDNO | LANDANDO CARTAGE INC | | | SCAC3 |
| 1831 | LDNP | LUNDINA K/S | | | SCAC3 |
| 1832 | LDNQ | LEYDEN TRANSPORTATION INC | | | SCAC3 |
| 1833 | LDNR | LINEA TRANSPORTADORA DEL NORTE INTE | | | SCAC4 |
| 1834 | LDNS | LUND TRUCKING | | | SCAC3 |
| 1835 | LDNT | LAUDON TRUCKING | | | SCAC3 |
| 1836 | LDNT | LONDON TRANSPORT INC | | | SCAC4 |
| 1837 | LDNW | LANE DISPATCHING AND WAREHOUSING IN | | | SCAC3 |
| 1838 | LDO | Elisusa | Callsign: Elisusa, | I | AVCODES |
| 1839 | LDOC | LEEDON TRANSPORTATION COMPANY INC | | | SCAC3 |
| 1840 | LDOI | LEDCO INC | | | SCAC3 |
| 1841 | LDOI | LEDCO EXPRESS | | | SCAC4 |
| 1842 | LDOL | LANDOLL CORPORATION | | | SCAC4 |
| 1843 | LDON | LONDON CARTAGE AND DELIVERY | | | SCAC3 |
| 1844 | LDON | LAFORGE DOORS LTD | | | SCAC4 |
| 1845 | LDOP | LOOP INC | | | SCAC3 |
| 1846 | LDOT | LAND OVER TRUCKING INC | | | SCAC3 |
| 1847 | LDP | Locomotive Demand Power | | AUS | TRAFFIC |
| 1848 | LDPB | LANOUE, ANDRE PONTIAC BUICK INC | | | SCAC4 |
| 1849 | LDPC | LAND TRANSPORTATION CORPORATION | | | SCAC3 |
| 1850 | LDPE | LDT IMPORT-EXPORT | | | SCAC4 |
| 1851 | LDPI | LOAD-PRO INC | | | SCAC4 |
| 1852 | LDPN | LYN-DEL TRANSPORTATION | | | SCAC3 |
| 1853 | LDPO | LOADPOWER OF CLEVELAND | | | SCAC3 |
| 1854 | LDPQ | LDP TRUCKING | | | SCAC3 |
| 1855 | LDPR | LOGISTICS AND DISTRIBUTION SERVICES | | | SCAC4 |
| 1856 | LDPS | L E D ENTERPRISES INC | | | SCAC3 |
| 1857 | LDPW | LINE DRIVE POWER ONLY TRUCKING LLC | | | SCAC4 |
| 1858 | LDQA | LADY ANNA SHIPPING LTD | | | SCAC3 |
| 1859 | LDQC | LADY CLARA SHIPPING LTD LIMASSOL CY | | | SCAC3 |
| 1860 | LDQG | LADY GRETA SHIPPING LTD LIMASSOL CY | | | SCAC3 |
| 1861 | LDQH | LEADER SHIPPING LTD. | | | SCAC3 |
| 1862 | LDQL | LADY LINDA SHIPPING LTD LIMASSOL CY | | | SCAC3 |
| 1863 | LDQV | LUNDQVIST REDERIERNA | | | SCAC3 |
| 1864 | LDR | Aero Lider, S.A. de C.V. | Callsign: Aerolider, | MEX | AVCODES |
| 1865 | LDR | Aero Lider | | | ICAO1 |
| 1866 | LDRC | LOADER CONSTRUCTION | | | SCAC3 |
| 1867 | LDRI | LEGEND TRANSPORTATION INC | | | SCAC3 |
| 1868 | LDRK | LAUDER TRUCKING INC | | | SCAC3 |
| 1869 | LDRL | LANDSTAR T.L.C., INC. | | | SCAC1 |
| 1870 | LDRN | LODE RUNNER | | | SCAC3 |
| 1871 | LDRN | LODERUNNER | | | SCAC4 |
| 1872 | LDRO | LEADER LOGISTICS INC | | | SCAC4 |
| 1873 | LDRP | LEADER TRANSPORTATION INC | | | SCAC3 |
| 1874 | LDRR | Louisiana & Delta R.R., Inc. | added 7/1987; 1/1994-7/2000; eliminated 7/2003; 7/2005 | | NAKINA |
| 1875 | LDRR | Louisiana & Delta R.R., Inc. | added 7/87; 1/94-7/2000 | | NRHS |
| 1876 | LDRR | LOUISIANA & DELTA RAILROAD, INC. | | | PWRC |
| 1877 | LDRR | Louisiana and Delta Railroad | | | RSRV |
| 1878 | LDRR | LOUISIANA & DELTA RAILROAD INC | | | SCAC3 |
| 1879 | LDRR | LOUISIANA & DELTA RAILROAD INC | | | SCAC4 |
| 1880 | LDRS | L D R TRANSPORT INC | | | SCAC3 |
| 1881 | LDRS | LEADER SERVICES INC | | | SCAC4 |
| 1882 | LDRT | The Lake Front Dock & R.R. Terminal Co. | 1/1975-1/1994 | | NAKINA |
| 1883 | LDRT | The Lake Front Dock & R.R. Terminal Co. | 1/75-1/94 | | NRHS |
| 1884 | LDRT | RETIRED 01-28-93 ATP (407) [LAKE FRONT DOCK & RAILROAD TERMINAL CO.] | | | PWRC |
| 1885 | LDRT | Lake Front Dock and Railroad Terminal | | | RSRV |
| 1886 | LDRT | LAKEFRONT DOCK AND RAILROAD TERMINA | | | SCAC3 |
| 1887 | LDRT | LINE-DRIVE TRANSPORTATION INC | | | SCAC4 |
| 1888 | LDRU | TURKEY RUSSIA LOGISTICS CORPORATION | | TR | BIC |
| 1889 | LDRX | LOCODOCS, INC. | | | PWRC |
| 1890 | LDRX | LOCODOCS INC | | | SCAC4 |
| 1891 | LDRY | LANDRY, DURK TRUCKING LLC | | | SCAC4 |
| 1892 | LDS | Lineas Aereas del Sur S.A. | Callsign: Linsur, Founded in 2007 and commenced operations in 2008. Operating certificate suspened on 01 June 2012. | RA | AVCODES |
| 1893 | LDS | Logistik Dienstleistungen und Service GmbH | Eutin | D | privat-bahn.de |
| 1894 | LDS | Logistik Dienstleistung und Service GmbH | | D | TRAFFIC |
| 1895 | LDS | Logistik Dienstleistung und Service GmbH | | DE | VKM |
| 1896 | LDSA | LOADSTAR MANAGEMENT INC ATHENS GR | | | SCAC3 |
| 1897 | LDSC | LANDSCO CORP | | | SCAC3 |
| 1898 | LDSC | LODESTAR TRANSPORT INC | | | SCAC4 |
| 1899 | LDSD | LINDSEY DEDICATED SERVICES INC | | | SCAC4 |
| 1900 | LDSF | L D S FORWARDING | | | SCAC3 |
