Airlines — L
- LNILion Mentari Airlines
- LEULions-Air
- LIXLionXpress
- LYFLithuanian Air Force
- LRALittle Red Air Service
- LVGLivingston
- LLBLloyd Aereo Boliviano
- LNALnair Air Services
- LOCLocair
- LACLockeed Aircraft Corporation
- XLGLockheed Air Terminal
- XDDLockheed DUATS
- CBDLockheed Martin Aeronautics
- LNGLockheed Martin Aeronautics Company
- LOGLogan Air
- CLVLom Praha Flying School
- LMSLomas Helicopters
- LCYLondon City Airport Jet Centre
- LNXLondon Executive Aviation
- LOVLondon Flight Centre (Stansted)
- LHCLondon Helicopter Centres
- LSSLone Star Airlines
- ORALong Island Airlines
- LGTLongtail Aviation
- LRRLorraine Aviation
- LSCLos Cedros Aviacion
- LOSLossiemouth Flying Training Unit
- LOTLOT Polish Airlines
- TASLotus Air
- YZZLSM AIRLINES
- UWWLSM International
- LTELTE International Airways
- LTOLTU Austria
- LTULTU International
- JFCLTV Jet Fleet Corporation
- LJJLuchsh Airlines
- LTWLuchtvaartmaatschappij Twente
- LKELucky Air
- LUTLuft Carago
- LVDLuftfahrt-Vermietungs-Dienst
- LGWLuftfahrtgesellschaft Walter
- DLHLufthansa
- GECLufthansa Cargo
- CLHLufthansa CityLine
- LHTLufthansa Technik
- LTFLufttaxi Fluggesellschaft
- LTRLufttransport
- LHSLuhansk
- LUKLUKoil-Avia
- UNYLund University School of Aviation
- LGLLuxair
- LXALuxaviation
- LUVLuxembourg Air Rescue
- LFELuxflight Executive
- LXOLuxor Air
- LUZLuzair
- UKWLviv Airlines
- LYDLydd Air
- LCHLynch Flying Service
- LYCLynden Air Cargo
- LXFLynx Air International
- LYXLynx Aviation
- SSXLynx Aviation (L3/SSX)