| LAA | LN | 148 | Libyan Arab Airlines |
| LAB | JF | 510 | Lab Flying Service |
| LAI | QL | 721 | Lesotho Airways |
| LAJ | KJ | 436 | British Mediterranean Airways |
| LAL | WJ | 927 | Air Labrador |
| LAM | TM | 068 | LAM-Linhas Aereas de Mozambique |
| LAN | LA | 045 | LAN Airlines |
| LAO | QV | 627 | Lao Airways |
| LAP | PZ | 692 | TAM Mercosur |
| LAU | LAS-Lineas Aereas Suramericanas | ||
| LAV | VH | 152 | Aeropostal Alas de Venezuela |
| LAZ | LZ | 196 | Balkan Bulgarian Airlines |
| LBC | LV | 639 | Albanian Airlines |
| LBE | Elbee Airlines | ||
| LBH | 7Z | 569 | Laker Bahamas |
| LBR | Elbe Air Lufttransport | ||
| LBT | BJ | Nouvel Air Tunisie | |
| LBY | LZ | Belle Air | |
| LCD | ZE | 994 | Lineas Aereas Azteca |
| LCI | LF | 212 | Lufthansa Cargo India |
| LCO | UC | 145 | LAN Cargo |
| LDA | NG | 231 | Lauda Air |
| LDE | 5U | 022 | Lineas Aereas Del Estado |
| LDI | L4 | 372 | Lauda Air Italy |
| LEI | 543 | Leisure International Airways | |
| LER | KZ | 722 | Linea Aerea |
| LFA | H7 | 770 | Air Alfa |
| LGL | LG | 149 | Luxair |
| LGW | HE | Walter Airlines | |
| LHN | EO | Express One International | |
| LIA | LI | 140 | LIAT (1974) |
| LIB | VD | 718 | Air Liberte |
| LIC | LC | LAC Colombia - Lineas Aereas del Caribe | |
| LIE | Al Dawood | ||
| LII | Zhukovsky | ||
| LIK | Aliansa Colombia - Aerolineas Andinas SA | ||
| LIL | TE | 874 | flyLAL - Lithuanian Airlines |
| LIN | LinAir Hungarian Regional Airline | ||
| LIT | FU | 659 | Air Littoral |
| LIV | Air Livonia | ||
| LKR | 6F | 385 | Laker Airways |
| LLB | LB | 051 | Lloyd Aereo Boliviano (LAB) |
| LLE | LL | Allegro Air | |
| LLM | YL | 511 | Yamal Airlines |
| LLR | CD | 296 | Alliance Air |
| LMR | Lemanair | ||
| LNI | JT | Lion Airlines | |
| LNK | 4Z | 749 | Airlink |
| LOG | LC | 122 | Loganair |
| LON | Avilond TAC | ||
| LOT | LO | 080 | LOT Polish Airlines |
| LPE | LP | 544 | Lan Peru |
| LPR | MJ | 069 | LAPA Lineas Aereas Privadas Argentinas |
| LPS | Alpe Air | ||
| LPV | A6 | 527 | Air Alps |
| LRC | LR | 133 | LACSA-Lineas Aéreas Costarricenses |
| LRE | Lasare Air | ||
| LRS | RZ | 503 | SANSA Servicios Aereos Nacionales |
| LSB | Lensibavia | ||
| LSI | Alis | ||
| LSK | Aurela | ||
| LSU | Laus Air | ||
| LSV | Alak of Russia | ||
| LTC | 6Y | Latcharter | |
| LTE | XO | LTE International Airways | |
| LTL | PV | 559 | Latavio - Latvian Airlines |
| LTN | 516 | Aerolineas Latinas (Aerolatin) | |
| LTP | Latpass | ||
| LTU | LT | 266 | LTU International Airways |
| LUP | Lupenga Aircharter | ||
| LVB | IRS Airlines | ||
| LVR | Aviavilsa | ||
| LWA | LE | Liberia World Airlines | |
| LXG | L8 | Air Luxor GB, Lda | |
| LXR | LK | 040 | Air Luxor |
| LYC | L2 | 344 | Lynden Air Cargo |
| LYN | QH | Altyn Air | |
| LYT | Apatas | ||
| LZB | FB | Bulgaria Air |