| 1 | NL | Shaheen Air International Limited | ICAO: SAI, Callsign: Shaheen Air, IATA Prefix: 740, Established in 1984. Commenced operations in December 1993. Ceased operations on 06 October 2018. | PK | AVCODES |
| 2 | NL | Lauda Air Italy | ICAO: LDI, IATA designator changed to L4 | I | AVCODES |
| 3 | NL | Air Liberia | ICAO: ALI, Callsign: November Lima, Designator NL recalled by IATA | LB | AVCODES |
| 4 | NL | Lierian National Airlines | | LB | AVCODES |
| 5 | NL | Zapolyarye, Airline Company | ICAO: PZY, Callsign: Zapolyarye, Ceased operations. | RUS | AVCODES |
| 6 | NL | Aero4M d.o.o. | ICAO: AEH, Callsign: Aerocutter, Name changed to Aero4M d.o.o. d/b/a Amelia International w.e.f. 18 July 2019. | SLO | AVCODES |
| 7 | NL | Aero4M d.o.o. d/b/a Amelia International | ICAO: AEH, Callsign: Aerocutter, ICAO Callsign changed to Vega. Name changed from Aero4M d.o.o. w.e.f. 18 July 2019. | SLO | AVCODES |
| 8 | NL | Aero4M d.o.o. d/b/a Amelia International | ICAO: AEH, Callsign: Vega, ICAO Callsign changed from Aerocutter. Name changed from Aero4M d.o.o. w.e.f. 18 July 2019. | SLO | AVCODES |
| 9 | NL&G | North Louisiana & Gulf R.R. Co. | added 11/1973 | | NAKINA |
| 10 | NL&G | North Louisiana & Gulf R.R. Co. | added 11/73 | | NRHS |
| 11 | NL&G | NORTH LOUISIANA & GULF RAILROAD CO. | | | PWRC |
| 12 | NLA | Peninsula Airways, Inc. t/a PenAir | IATA: KS, Callsign: Peninsula, IATA Prefix: 339, IATA designator KS recalled by IATA. | USA | AVCODES |
| 13 | NLA | Neiltown Air Ltd. | Callsign: Neiltown Air, | CDN | AVCODES |
| 14 | NLA | Peninsula Airways, Inc. t/a PenAir | Callsign: Peninsula, IATA designator KS recalled by IATA. | USA | AVCODES |
| 15 | NLA | Neiltown Air | | | ICAO1 |
| 16 | NLAD | NIGRO, LOUIS ALEXANDER | | | SCAC4 |
| 17 | NLAE | NO LIMITS TRUCKING | | | SCAC4 |
| 18 | NLAF | NLNOVALINK | | | SCAC4 |
| 19 | NLAN | N-LAND TRANSPORTATION INC | | | SCAC3 |
| 20 | NLAN | NOLANS FARM EQUIPMENT INC | | | SCAC4 |
| 21 | NLAS | NELSON A V & SONS | | | SCAC3 |
| 22 | NLAT | NEAL, AUSTIN TRUCKING | | | SCAC3 |
| 23 | NLAT | NYK LOGISTICS AMERICAS-TRANSPORTATI | | | SCAC4 |
| 24 | NLAU | NRS LOGISTICS AMERICA INC. | | USA | BIC |
| 25 | NLAX | National Aeronautics and Space Administration | added 4/1966; 10/1966-4/1970; eliminated 10/1974; added 7/1982; 1/1994-7/2000; eliminated 1/2004; 7/2005 (not listed) | | NAKINA |
| 26 | NLAX | National Aeronautics and Space Administration | added 4/66; 10/66-4/70; eliminated 10/74; added 7/82; 1/94-7/2000 | | NRHS |
| 27 | NLAX | NATIONAL AERONAUTICS & SPACE ADM. (NASA) | | | PWRC |
| 28 | NLAX | National Aeronautics and Space Administration (NASA) | | | RSRV |
| 29 | NLAX | NATIONAL AERONAUTICS & SPACE | | | SCAC4 |
| 30 | NLB | Novosibirsk Airlines | IATA: L8, Voluntary Surrender of IATA prefix | RUS | AVCODES |
| 31 | NLB | NORTHFIELD LINES INC | | | SCAC4 |
| 32 | NLB | New Lantau Bus | City: Hong Kong | HK | TRAFFIC |
| 33 | NLB | Verein Neue Landesbahn | | AT | VKM |
| 34 | NLBA | NATIONAL BAIT INC | | | SCAC4 |
| 35 | NLBC | N L B CORP | | | SCAC3 |
| 36 | NLBC | NIELSEN BROS INCORPORATED | | | SCAC4 |
| 37 | NLBE | NIGHT LIGHTS BY BEBEE LTD | | | SCAC4 |
| 38 | NLBL | NEW LONDON-BRADLEY LIMOUSINE SERVIC | | | SCAC3 |
| 39 | NLBP | NATIONAL LUBRICATING PRODUCTS CO | | | SCAC4 |
| 40 | NLBS | NELSONS BUS SERVICE INC | | | SCAC3 |
| 41 | NLBU | NEDLLOYD LINES | | | SCAC3 |
| 42 | NLBU | NEDLLOYD LIJNEN, BV | | | SCAC4 |
| 43 | NLC | Nelair Charter (PTY) Ltd. | Callsign: Nelair, | ZA | AVCODES |
| 44 | NLC | Nelair Charters | | | ICAO1 |
| 45 | NLC | Missouri Pacific System | eliminated 1/1979 | | NAKINA |
| 46 | NLC | New Orleans and Lower Coast R.R. Co. | 1/1950-10/1966 & 1/1975 | | NAKINA |
| 47 | NLC | New Orleans and Lower Coast R.R. Co. | 1/52-10/66 & 1/75 | | NRHS |
| 48 | NLC | Missouri Pacific System | eliminated 1/79 | | NRHS |
| 49 | NLC | MISSOURI PACIFIC RAILROAD [NEW ORLEANS & LOWER COAST RR] | | | PWRC |
| 50 | NLCA | NORTH LOUISIANA CRANES LLC | | | SCAC4 |
| 51 | NLCB | NORTHLAND CHARTER BUS SERVICE | | | SCAC3 |
| 52 | NLCB | NORTHLAND CHARTER BUS SERVICE | | | SCAC4 |
| 53 | NLCH | NORTHLAND COACHES | | | SCAC3 |
| 54 | NLCL | Northern Lands Railway (Neyveli Lignite Corporation Limited) | | | RSRV |
| 55 | NLCL | NOVA LUMBER CO LTD | | | SCAC3 |
| 56 | NLCL | NOVA LUMBER CO LTD | | | SCAC4 |
| 57 | NLCM | NORTHWAY LIGNIN CHEMICAL | | | SCAC4 |
| 58 | NLCO | N L C TRANSPORT | | | SCAC4 |
| 59 | NLCQ | NEILL, L., CARTAGE CO. | | | SCAC3 |
| 60 | NLCQ | NEILL, L CARTAGE COMPANY INC | | | SCAC4 |
| 61 | NLCR | NATIONAL COURIER | | | SCAC3 |
| 62 | NLCT | NLC TRANSPORTATION LLC | | | SCAC4 |
| 63 | NLCU | LVNF NUCLEAR & LOGISTIC CONSULTING | | F | BIC |
| 64 | NLCV | NAURI LOGISTICS CO LTD | | | SCAC4 |
| 65 | NLCX | Namarib Ltd. Corp. | 4/1947 | | NAKINA |
| 66 | NLCX | Namarib Co. | 1/1950-7/1954; eliminated 4/1957 | | NAKINA |
| 67 | NLCX | Newberry Lumber & Chemical Co. | 1/1945-1/1946 | | NAKINA |
| 68 | NLCX | Namarib Co. | 1/52; eliminated 4/57 | | NRHS |
| 69 | NLCX | NAMARIB CO. [NEWBERRY LUMBER & CHEMICAL CO.] | | | PWRC |
| 70 | NLD | Namakwaland Lugdiens (EDMS) Bpk. | Callsign: November Juliett, | ZA | AVCODES |
| 71 | NLDC | NORTHLAND CHARTERS INC | | | SCAC3 |
| 72 | NLDD | NULAID FOODS INC | | | SCAC3 |
| 73 | NLDL | NORTHLAND LEASING CO INC | | | SCAC3 |
| 74 | NLDO | NOLTE, DON | | | SCAC3 |
| 75 | NLDS | NORTHLAND TRANSPORTATION SERVICES I | | | SCAC3 |
| 76 | NLDT | NORTHLAND TRAVEL | | | SCAC3 |
| 77 | NLDU | TDG EUROPEAN CHEMICALS | | | SCAC4 |
| 78 | NLDY | NORTHERN LIGHTS DAIRY | | | SCAC4 |
| 79 | NLDZ | NORTHLAND TRUCKING INC | | | SCAC4 |
| 80 | NLE | Northern Air Services | Callsign: Northern, | ZA | AVCODES |
| 81 | NLE | Boston-Maine Airways d/b/a FAA William J. Hughes Technical Center Shuttle | Callsign: Nellie, | USA | AVCODES |
| 82 | NLE | National Airlines | Callsign: Silver Streak, | USA | AVCODES |
| 83 | NLE | Niederlausitzer Eisenbahn | | D | TRAFFIC |
| 84 | NLEA | NATIONAL LTL EXPRESS CORP | | | SCAC4 |
| 85 | NLEC | NATIONAL LEASE CORP | | | SCAC3 |
| 86 | NLEI | NELSON EXPRESS INC | | | SCAC3 |
| 87 | NLEN | NILSON CO | | | SCAC3 |
| 88 | NLEP | NOEL EXPRESS | | | SCAC3 |
| 89 | NLEP | NORTHERN LIGHTS EXPEDITIONS LTD | | | SCAC4 |
| 90 | NLEQ | NATIONAL EQUIPMENT SERVICES L C | | | SCAC4 |
| 91 | NLER | NELSON, LEROY | | | SCAC4 |
| 92 | NLET | NELSON EXCAVATING AND TRUCKING | | | SCAC3 |
| 93 | NLF | Westair Aviation, Inc. | Callsign: Northern Life, | CDN | AVCODES |
| 94 | NLFE | NIELSENS FEED | | | SCAC3 |
| 95 | NLFH | NEVER LATE FREIGHT | | | SCAC4 |
| 96 | NLFI | NATIONAL FREIGHT INC (INTERMODAL DI | | | SCAC4 |
| 97 | NLFL | NEW LINE FREIGHT LLC | | | SCAC4 |
| 98 | NLFM | NICKEL LANE FARMS | | | SCAC4 |
| 99 | NLFO | NATIONAL FUEL OIL INC | | | SCAC4 |
| 100 | NLFR | NORTON, LINDA FREIGHT SERVICE INC | | | SCAC3 |
