| 1 | LH | Deutsche Lufthansa AG | ICAO: DLH, Callsign: Lufthansa, IATA Prefix: 220, | D | AVCODES |
| 2 | LH | Lufthansa Cargo AG | ICAO: GEC, Callsign: Lufthansa Cargo, IATA Prefix: 020, Designator YY recalled by IATA | D | AVCODES |
| 3 | LH | Lufthansa | | D | TRAFFIC |
| 4 | LH&G | Lufkin, Hemphill & Gulf Ry. Co. | 7/1923-7/1936 | | NAKINA |
| 5 | LH&G | LUFKIN, HEMPHILL & GULF RWY. CO. | | | PWRC |
| 6 | LH&S | Louisville, Henderson & St. Louis Ry. Co. | 4/1938 | | NAKINA |
| 7 | LH&S | Louisville, Henderson & St. Louis Ry. Co. (Louisville & Nashville R.R. Co.) | 7/1930-7/1936 | | NAKINA |
| 8 | LH&S | Louisville, Henderson & St. Louis Ry. Co. | 8/1920-7/1923 | | NAKINA |
| 9 | LH&S | LOUISVILLE, HENDERSON & ST. LOUIS RWY. CO. | | | PWRC |
| 10 | LHA | Guangdong Longhao Airlines Co., Ltd. | IATA: GI, Callsign: Air Canton, Name changed to Zhongyuan Longhao Airlines Co., Ltd. Commenced operations on 29 March 2017. | PRC | AVCODES |
| 11 | LHA | Zhongyuan Longhao Airlines Co., Ltd. | IATA: GI, Callsign: Air Canton, Name changed to China Central Longhao Airlines Co., Ltd. Name changed from Guangdong Longhao Airlines Co., Ltd. Commenced operations on 29 March 2017. | PRC | AVCODES |
| 12 | LHA | China Central Airlines Co., Ltd. | IATA: GI, Callsign: Air Canton, Name changed from Zhongyuan Longhao Airlines Co., Ltd. and previously changed from Guangdong Longhao Airlines Co., Ltd. Commenced operations on 29 March 2017. | PRC | AVCODES |
| 13 | LHAE | LUMBER HARDWARE AND EXPORTS INC | | | SCAC4 |
| 14 | LHAI | LAVEZZI, H A CO INC | | | SCAC3 |
| 15 | LHAR | LYONS & HARPER ANTIQUES | | | SCAC4 |
| 16 | LHB | Liebherr Geschaeftreiseflugzeug Gbr | Callsign: Family, Name changed to Liebherr-Aviation GmbH | D | AVCODES |
| 17 | LHB | Liebherr-Aviation GmbH | Callsign: Family, Name changed from Liebherr Geschaeftreiseflugzeug Gbr | D | AVCODES |
| 18 | LHB | LIEBHERR-HYDRALIKBAGGET Gmbh | | DE | VKM |
| 19 | LHBB | LEACH BROTHERS BROKERAGE INC | | | SCAC4 |
| 20 | LHBT | LHB TRUCKING INC | | | SCAC4 |
| 21 | LHC | London Helicopter Centres Ltd. | Callsign: Mustang, Name changed to BIH (Onshore) Ltd. ICAO callsign changed from Elate Sea | GB | AVCODES |
| 22 | LHC | BIH (Onshore) Ltd. | Callsign: Mustang, Name changed from London Helicopter Centres Ltd. ICAO callsign changed from Elate Sea | GB | AVCODES |
| 23 | LHC | London Helicopter Charters Ltd. | Callsign: London Eye, Name changed to A2B Heli (Charters) Limited on 23 October 2018. Name changed from BIH (Onshore) Ltd. ICAO callsign changed from Mustang. | GB | AVCODES |
| 24 | LHC | A2B Heli (Charters) Limited | Callsign: London Eye, Name changed from London Helicopter Charters Ltd. Name changed from BIH (Onshore) Ltd. ICAO callsign changed from Mustang. | GB | AVCODES |
| 25 | LHC | London Helicopter Centres | | | ICAO1 |
| 26 | LHCI | LHC INC | | | SCAC3 |
| 27 | LHCO | LEHMAN TRANSPORTATION CO | | | SCAC3 |
| 28 | LHCO | LATHA TRANSPORT | | | SCAC4 |
| 29 | LHCP | LEROY DEDICATED LOGISTICS INC | | | SCAC4 |
| 30 | LHCX | LOUISVILLE, HARRODS CREEK & WESTPORT RAILROAD FOUNDATION | | | PWRC |
| 31 | LHDI | LONGHORN DISTRIBUTORS INC | | | SCAC3 |
| 32 | LHDL | LEHMAN, DONALD L | | | SCAC3 |
| 33 | LHEA | LOHEAC, STEVEN HORSE TRANSPORTATION | | | SCAC4 |
| 34 | LHEB | LAKE HICKORY EXPRESS LLC | | | SCAC4 |
| 35 | LHEC | L H E INC | | | SCAC4 |
| 36 | LHED | LAKESIDE HEAVY EQUIPMENT LTD | | | SCAC4 |
| 37 | LHEI | L & H ENTERPRISES INC | | | SCAC3 |
| 38 | LHEJL | Lukáš Hejl | | CZ | VKM |
| 39 | LHEL | LEVITT, DOUG STUDIOS | | | SCAC4 |
| 40 | LHES | LEACH ENTERPRISES | | | SCAC3 |
| 41 | LHEU | BLUE SKY (HK) INTERNATIONAL TRADING LIMITED | | HK | BIC |
| 42 | LHEY | LAHEY, L M CONTRACTING | | | SCAC4 |
| 43 | LHFF | LHF FREIGHT INC | | | SCAC3 |
| 44 | LHFM | LIGHTHOUSE FARMS | | | SCAC3 |
| 45 | LHFR | LOHSE FARM AND RANCH LTD | | | SCAC4 |
| 46 | LHFX | Lehigh Heavy Forge Corp. | 7/2000-7/2005 (not listed) | | NAKINA |
| 47 | LHFX | Lehigh Heavy Forge Corp. | Jul-00 | | NRHS |
| 48 | LHFX | LEHIGH HEAVY FORGE CORPORATION | | | PWRC |
| 49 | LHFX | Lehigh Heavy Forge Corporation | | | RSRV |
| 50 | LHFX | LEHIGH HEAVY FORGE CORPORATION | | | SCAC4 |
| 51 | LHG | Aviation Leader General Aviation Co., Ltd | Callsign: Air Leader, | PRC | AVCODES |
| 52 | LHGT | LEHIGH TRANSPORT INC | | | SCAC3 |
| 53 | LHGT | LABA HOLDINGS LTD | | | SCAC4 |
| 54 | LHGU | LINDE - GLOBAL HELIUM | | USA | BIC |
| 55 | LHGX | Griffing Tank Car Line | added 4/1965; 7/1965-4/1970; eliminated 10/1971 | | NAKINA |
| 56 | LHGX | Griffing Tank Car Line | added 4/65; 7/65-4/70; eliminated 10/71 | | NRHS |
| 57 | LHGX | GRIFFING TANK CAR LINE | | | PWRC |
| 58 | LHHI | LINDAMOOD HEAVY HAULING INC | | | SCAC4 |
| 59 | LHHL | LAUREL HIGHLANDS HEAVY HAULL LLC | | | SCAC4 |
| 60 | LHHM | LONG, HARRY H MOVING-STORAGE & EXPR | | | SCAC3 |
| 61 | LHHM | LONG, HARRY H MOVING-STORAGE & EXPR | | | SCAC4 |
| 62 | LHHN | Lehigh Hanson Heidelberg Cement Group | | USA | TRAFFIC |
| 63 | LHIL | London Borough of Hillingdon | | GB | TRAFFIC |
| 64 | LHJN | LOPEZ HERNANDEZ, JULIAN | | | SCAC4 |
| 65 | LHJS | LUIS HINOJOSA, JOSE | | | SCAC4 |
| 66 | LHK | Lahak Aviation Ltd. | Callsign: Lahak, | IL | AVCODES |
| 67 | LHKL | LEIGHTON TRUCKING LLC | | | SCAC4 |
| 68 | LHLC | LAUREL HILL LUMBER CO INC | | | SCAC3 |
| 69 | LHLI | LONG HAUL LINE INC | | | SCAC3 |
| 70 | LHLI | LINEHAUL LOGISTICS INC | | | SCAC4 |
| 71 | LHLL | LETOURNEAU HAULING LLC | | | SCAC4 |
| 72 | LHLT | LONG HAUL TRUCKING INC | | | SCAC3 |
| 73 | LHLT | LONG HAUL TRUCKING INC | | | SCAC4 |
| 74 | LHM | Lockheed Martin | | USA | AVCODES |
| 75 | LHMA | LEHMANN, ALFRED | | | SCAC3 |
| 76 | LHMA | LEHMANN, ALFRED | | | SCAC4 |
| 77 | LHMH | LEHMANN, HANS KG | | | SCAC4 |
| 78 | LHMI | L & H MANAGEMENT SERVICES LLC | | | SCAC4 |
| 79 | LHMN | LEHMAN CARTAGE, INC | | | SCAC3 |
| 80 | LHMR | LUNCHMEAT EXPRESS INC | | | SCAC4 |
| 81 | LHMS | LOVE, HOWARD MACHINERY & SUPPLY CO | | | SCAC3 |
| 82 | LHMT | LIGHTHOUSE BOAT TRANSPORT INC | | | SCAC3 |
| 83 | LHMT | LOCATION HAUTE MATAWINIE INC | | | SCAC4 |
| 84 | LHMU | LIEBHERR MCCTEC ROSTOCK GMBH | | D | BIC |
| 85 | LHN | Express One International, Inc. | IATA: EO, Callsign: Longhorn, Found in 1983. Ceased operations. | USA | AVCODES |
| 86 | LHN | Express One International | IATA: EO | | ICAO1 |
| 87 | LHNM | LEACH INTERNATIONAL MEXICO | | | SCAC4 |
| 88 | LHNT | LEHN TRUCKING, INC. | | | SCAC3 |
| 89 | LHNT | LEHN TRUCKING INC | | | SCAC4 |
| 90 | LHOL | LAMPADA HOLSTEINS | | | SCAC4 |
| 91 | LHOT | L H O TRANSPORT INC | | | SCAC4 |
| 92 | LHPC | LONGHORN PRODUCE COMPANY | | | SCAC4 |
| 93 | LHPK | LEONARD & HARRAL PACKING COMPANY | | | SCAC3 |
| 94 | LHPN | LEE HY PAVING CORPORATION | | | SCAC4 |
| 95 | LHPT | L.H.P. TRANSPORTATION SERVICES, INC | | | SCAC3 |
| 96 | LHPX | Hilgy's LP Gas Inc. | added 7/1974; eliminated 10/1974 | | NAKINA |
| 97 | LHPX | Hilgy's LP Gas Inc. | added 7/74; eliminated 10/74 | | NRHS |
| 98 | LHPX | HILGY'S LP GAS INC. | | | PWRC |
| 99 | LHR | Al Ahram Aviation | Callsign: Al Ahram, | ET | AVCODES |
| 100 | LHR | Al Ahram Aviation | | | ICAO1 |
