| L2 | LYC | 344 | Lynden Air Cargo |
| L3 | JOS | 947 | DHL de Guatemala |
| L4 | ATG | Atlant SV Airlines | |
| L4 | LDI | 372 | Lauda Air Italy |
| L6 | AMI | 900 | Air Maldives |
| L8 | NLB | Novosibirsk Airlines | |
| L8 | LXG | Air Luxor GB, Lda | |
| L9 | MLI | 109 | Air Mali S.A. |
| LA | LAN | 045 | LAN Airlines |
| LB | LLB | 051 | Lloyd Aereo Boliviano (LAB) |
| LC | LIC | LAC Colombia - Lineas Aereas del Caribe | |
| LC | LOG | 122 | Loganair |
| LC | VLO | VarigLog | |
| LD | AHK | 288 | Air Hong Kong |
| LE | LWA | Liberia World Airlines | |
| LE | 969 | Laparkan Airways | |
| LF | 247 | Linjeflyg | |
| LF | LCI | 212 | Lufthansa Cargo India |
| LG | LGL | 149 | Luxair |
| LH | GEC | 020 | Lufthansa Cargo |
| LH | DLH | 220 | Lufthansa |
| LI | LIA | 140 | LIAT (1974) |
| LJ | SLA | 690 | Sierra National Airlines |
| LK | LXR | 040 | Air Luxor |
| LL | LLE | Allegro Air | |
| LL | GRO | 902 | Lineas Aereas Allegro |
| LM | ALM | 119 | ALM Airline |
| LN | LAA | 148 | Libyan Arab Airlines |
| LO | LOT | 080 | LOT Polish Airlines |
| LP | LPE | 544 | Lan Peru |
| LQ | APC | 856 | Airpac Airlines |
| LQ | 228 | Air Guinea Cargo | |
| LR | LRC | 133 | LACSA-Lineas Aéreas Costarricenses |
| LS | EXS | Jet2.com | |
| LT | LTU | 266 | LTU International Airways |
| LU | TRN | Theron Airways | |
| LV | LBC | 639 | Albanian Airlines |
| LW | ANV | 568 | Pacific Wings |
| LX | SWR | 724 | Swiss WorldCargo |
| LY | ELY | 114 | El Al Israel Airlines |
| LZ | LAZ | 196 | Balkan Bulgarian Airlines |
| LZ | LBY | Belle Air |