| 3801 | NLTT | NATIONAL TOURS INC | | | SCAC3 |
| 3802 | NLTT | NLT TRANSPORTATION LTD | | | SCAC4 |
| 3803 | NLTV | NORTHEAST LOUISIANA TRAVEL SERVICE | | | SCAC3 |
| 3804 | NLTV | NOLT, VIRGIL TRUCKING LLC | | | SCAC4 |
| 3805 | NLTW | NATIONAL TRANSIT AIR INC | | | SCAC3 |
| 3806 | NLTW | NALL TRANSPORT INC | | | SCAC4 |
| 3807 | NLTX | Celtran, Inc., a Subsidiary of Celanese International Corp. | added 1/2006 | | NAKINA |
| 3808 | NLTX | National Starch & Chemical Co., c/o Celtran, Inc. | 7/2005; eliminated 1/2006 | | NAKINA |
| 3809 | NLTX | National Starch & Chemical Co., member of the ICI Group, Vinamul Polymers | added 10/2001 | | NAKINA |
| 3810 | NLTX | National Starch & Chemical Co., d/b/a Specialty Synthetic Polymers Division | added 10/1999; 7/2000; eliminated 10/2001 | | NAKINA |
| 3811 | NLTX | Nashtex Leasing Inc. | added 10/1990 | | NAKINA |
| 3812 | NLTX | Nashtex Leasing Inc. | added 10/90 | | NRHS |
| 3813 | NLTX | National Starch & Chemical Co., d/b/a Specialty Synthetic Polymers Division | added 10/99; 7/2000 | | NRHS |
| 3814 | NLTX | *NASHTEX LEASING INC. | | | PWRC |
| 3815 | NLTX | +CELTRAN, INC., SUB. OF CELANESE INTL. CORP. [NATIONAL STARCH AND CHEMICAL CO. - SPECIALITY SYNTHETIC POLYMERS DIV.] | | | PWRC |
| 3816 | NLTX | National Starch and Chemical | | | RSRV |
| 3817 | NLTX | CELTRAN INC A SUBSIDIARY OF | | | SCAC4 |
| 3818 | NLTY | NETFOR LTD | | | SCAC4 |
| 3819 | NLU | InselAir Aruba N.V. d/b/a InselAir Aruba | IATA: 8I, Callsign: Insel Aruba, IATA Prefix: 778, Ceased operations on 07 june 2017. | ARU | AVCODES |
| 3820 | NLUS | NILIUS CARTAGE | | | SCAC3 |
| 3821 | NLUS | NYK LOGISTICS (AMERICAS) INC | | | SCAC4 |
| 3822 | NLV | New Livingston S.p.A. | IATA: JN, Callsign: Seagull, Ceased Operations on 06 October 2014. Founded 2011 | I | AVCODES |
| 3823 | NLVT | NATURALLY VT | | | SCAC4 |
| 3824 | NLW | Nile Wings Aviation Services | Callsign: Nile Wings, | SUD | AVCODES |
| 3825 | NLW | Nile Wings Aviation Services | | | ICAO1 |
| 3826 | NLWL | NEDLAW LIVING WALLS | | | SCAC4 |
| 3827 | NLWM | NEWLONS WORLDWIDE MOVING INC | | | SCAC3 |
| 3828 | NLX | Allied Chemical, a Division of Allied Canada, Inc. | added 5/1983; eliminated 4/1984 | | NAKINA |
| 3829 | NLX | Allied Chemical Canada, Ltd. | 4/1970-1/1980; eliminated 5/1983 | | NAKINA |
| 3830 | NLX | Nichols Chemical Co., Ltd. (Allied Chemical Canada, Ltd.) | 10/1966 | | NAKINA |
| 3831 | NLX | Allied Chemical Canada, Ltd. | added 7/1963; 7/1965 | | NAKINA |
| 3832 | NLX | Nichols Chemical Co., Ltd. | 7/1923-4/1961; eliminated 7/1963 | | NAKINA |
| 3833 | NLX | Nichols Chemical Co., Ltd. | 4/38-4/61; eliminated 7/63 | | NRHS |
| 3834 | NLX | Allied Chemical Canada, Ltd. | added 7/63; 7/65 | | NRHS |
| 3835 | NLX | Nichols Chemical Co., Ltd. (Allied Chemical Canada, Ltd.) | Oct-66 | | NRHS |
| 3836 | NLX | Allied Chemical Canada, Ltd. | 4/70-1/80; eliminated 5/83 | | NRHS |
| 3837 | NLX | Allied Chemical, a Division of Allied Canada, Inc. | added 5/83; eliminated 4/84 | | NRHS |
| 3838 | NLX | RETIRED 02-12-91 FET (1390) [ALLIED CHEMICAL CANADA LTD.; NICHOLS CHEMICAL CO.] | | | PWRC |
| 3839 | NLX | Allied Chemical Canada | | | RSRV |
| 3840 | NLXI | NORTHLAND EXPRESS, INC | | | SCAC3 |
| 3841 | NLXP | NATIONAL EXPRESS INC | | | SCAC4 |
| 3842 | NLXU | THE NORTON LINE | | | SCAC3 |
| 3843 | NLXV | NEAL EXCAVATING CO | | | SCAC3 |
| 3844 | NLY | Niki Luftfahrt GmbH | IATA: HG, Callsign: flyniki, ICAO designator changed from AYP. Ceased operations on 14 December 2017. Name changed from Aero Lloyd Austria Luftfahrtb GmbH | A | AVCODES |
| 3845 | NLY | Niki | IATA: HG | | ICAO1 |
| 3846 | NM | The Mount Cook Group Ltd. | ICAO: NZM, Callsign: Mountcook, IATA Prefix: 445, Name changed to The Mount Cook Airline Ltd. | NZ | AVCODES |
| 3847 | NM | Mount Cook Airlines | Callsign: Mount cook, IATA Prefix: 445, | NZ | AVCODES |
| 3848 | NM | Air Madrid Lineas Aereas, S.A. | ICAO: DRI, Callsign: Alada Air, IATA Prefix: 476, ICAO designator changed to DRD | E | AVCODES |
| 3849 | NM | Air Madrid Lineas Aereas, S.A. | ICAO: DRD, Callsign: Alada Air, IATA Prefix: 476, Ceased operations on 15 December 2006. ICAO designator changed from DRI | E | AVCODES |
| 3850 | NM | The Mount Cook Airline Ltd. | ICAO: NZM, Callsign: Mountcook, IATA Prefix: 445, Name changed from The Mount Cook Group Ltd. | NZ | AVCODES |
| 3851 | NM | SAS Natireva t/a Air Moana | ICAO: NTR, | PF | AVCODES |
| 3852 | NMA | Billmans Management Ltd t/a Ansett New Zealand | IATA: NY, Callsign: Anza, | NZ | AVCODES |
| 3853 | NMA | Newmans Airways Limited | IATA: NY, Callsign: Newmans, | NZ | AVCODES |
| 3854 | NMA | Nesma Airlines Company Ltd. | IATA: NA, Callsign: Nesma, Commenced operations on on 18 July 2010. | ET | AVCODES |
| 3855 | NMAC | NEWMAN AND CREBBIN | | | SCAC3 |
| 3856 | NMAC | NEDA MARITIME AGENCY CO LTD | | | SCAC4 |
| 3857 | NMAG | NORKO MARINE AGENCY | | | SCAC3 |
| 3858 | NMAG | NORKO MARINE AGENCY INC | | | SCAC4 |
| 3859 | NMAI | NORDEN, M A CO INC | | | SCAC3 |
| 3860 | NMAI | NOR-MAR INDUSTRIES LTD | | | SCAC4 |
| 3861 | NMAS | NORTHERN MOVING & STORAGE | | | SCAC3 |
| 3862 | NMAS | NORTHLAND STEEL & TRIM LLC | | | SCAC4 |
| 3863 | NMAU | COMMANDER, NAVAL AIR SYSTEMS COMMAND AIR 6.7.6.2 | | USA | BIC |
| 3864 | NMAU | NAVAL AIR SYSTEMS | | | SCAC4 |
| 3865 | NMB | Air Namibia | IATA: SW, Callsign: Namibia, IATA Prefix: 186, Ceased operation on 11 February 2021. | NAM | AVCODES |
| 3866 | NMB | Air Namibia | IATA: SW | | ICAO1 |
| 3867 | NMBG | NAVIGATION MARITIME BULGARE | | | SCAC4 |
| 3868 | NMBS | Nationale Maatschappij van Belgische Spoorwegen | | BE | VKM |
| 3869 | NMCA | NORTHLAND MAINTENANCE COMPANY | | | SCAC4 |
| 3870 | NMCC | NISSAN MOTOR CAR CARRIER CO LTD | | | SCAC3 |
| 3871 | NMCC | NISSAN MOTOR CAR CARRIER CO | | | SCAC4 |
| 3872 | NMCG | NMC LOGISITICS INTERNATIONAL INC | | | SCAC4 |
| 3873 | NMCH | NATIONAL MOTOR COACH | | | SCAC3 |
| 3874 | NMCH | NATIONAL TRANSPORTATION COMPANY INC | | | SCAC4 |
| 3875 | NMCL | NMC LOGISTICS INTERNATIONAL CO LTD | | | SCAC4 |
| 3876 | NMCO | NEW MARINE CONSOLIDATION CO LTD | | | SCAC4 |
| 3877 | NMCW | NIEVES MARITIME CORP | | | SCAC4 |
| 3878 | NMCX | National Machinery Co. | added 4/1976; 1/1980-1/1994; eliminated 10/1998; 7/2000 (not listed) | | NAKINA |
| 3879 | NMCX | Merchants Despatch Transportation Corp. | added 7/1962; 7/1965-10/1966; eliminated 4/1967; 4/1970 | | NAKINA |
| 3880 | NMCX | Northern Refrigerator Line, Inc. | added 10/1955; 10/1957-4/1961; eliminated 7/1962 | | NAKINA |
| 3881 | NMCX | Northern Refrigerator Line, Inc. | 10/57-4/61 | | NRHS |
| 3882 | NMCX | Merchants Despatch Transportation Corp. | 7/65-10/66; eliminated 4/67; 4/70 | | NRHS |
| 3883 | NMCX | National Machinery Co. | added 4/76; 1/80-1/94; eliminated 10/98; 7/2000 | | NRHS |
| 3884 | NMCX | NATIONAL MACHINERY COMPANY (MERCHANTS DESPATCH TRANSPORTATION CORP.[NORTHERN REFRIGERATOR LINE INC.]) | | | PWRC |
| 3885 | NMCX | National Machinery | | | RSRV |
| 3886 | NMCZ | NORTHSHORE MINING CO. | | | PWRC |
| 3887 | NMD | Nomad Aviation (Pty) Ltd t/a Bay Air Aviation | IATA: N6, Callsign: Nomad Air, Operates flights obo flyafrica.com | NAM | AVCODES |
| 3888 | NMD | Nomad Aviation | | | ICAO1 |
| 3889 | NMDE | NOMADE TRANSPORT | | | SCAC4 |
| 3890 | NMDG | NORTH MISSISSIPPI DEVELOPMENT GROUP | | | SCAC4 |
| 3891 | NMDI | NATURESMATE DISTRIBUTION INC | | | SCAC4 |
| 3892 | NMDO | NEW MEXICO DISTRIBUTING | | | SCAC4 |
| 3893 | NMDS | NATIONAL MAIL DELIVERY SERVICE | | | SCAC3 |
| 3894 | NME | Neuköln - Mittenwalder Eisenbahn-Gesellschaft AG | Berlin | D | privat-bahn.de |
| 3895 | NME | Neukölln-Mittenwalder Eisenbahn-Gesellschaft AG | | D | TRAFFIC |
| 3896 | NME | Neukölln-Mittenwalder Eisenbahn-Gesellschaft | | DE | VKM |
| 3897 | NMEA | NEMEA E N E | | | SCAC3 |
| 3898 | NMEC | NUCHOICE MEDICAL | | | SCAC4 |
| 3899 | NMEI | NEWMARKE | | | SCAC4 |
| 3900 | NMEL | NOR-AM ENTERPRISES LTD | | | SCAC4 |
