| 1 | L4 | Lauda Air S.p.A. | ICAO: LDI, Callsign: Lauda Italy, IATA Prefix: 372, | I | AVCODES |
| 2 | L4 | Max Aviation Inc. | ICAO: MAX, Callsign: Max-Aviation, Designator L4* recalled by IATA | CDN | AVCODES |
| 3 | L4 | Wings of Lebanon S.a.l. | ICAO: WLB, Designator L4 recalled by IATA | RL | AVCODES |
| 4 | L4 | Linea Turistica Aereotuy Lta, C.A. | ICAO: TUY, Callsign: Aereotuy, IATA Prefix: 445, Ceased operations on 30 July 2018. IATA designator changed from LD. | YV | AVCODES |
| 5 | L4 | Legacy Air Co., Ltd. | ICAO: LGC, Callsign: Legacy Air, Founded in 2009 | T | AVCODES |
| 6 | L4 | Air Service Liege (A.S.L.) N.V. | ICAO: BNJ, Callsign: Jet Belgium, Founded in 1997. Merged into ASL Group. | B | AVCODES |
| 7 | L4 | Grupo LASA S.r.l. d/b/a LASA Líneas Aéreas | | RA | AVCODES |
| 8 | L4 | The Landline Company | Railway Service | USA | AVCODES |
| 9 | L480 | BROWN DISTRIBUTION CENTERS | | | SCAC3 |
