| 5901 | NSZJ | NUSZ, JIM TRUCKING | | | SCAC3 |
| 5902 | NT | Binter Canarias, S.A. | ICAO: IBB, | E | AVCODES |
| 5903 | NT | Northair Aviation Ltd. | ICAO: NTL, Callsign: Northair, Merged into Knight Air during 1990 | GB | AVCODES |
| 5904 | NT | Northern Air Taxis Ltd. | Callsign: Northair, Name changed to Northair Aviation Ltd. | GB | AVCODES |
| 5905 | NT | Continental International Airways | | EAT | AVCODES |
| 5906 | NT | NORFOLK TERMINAL | | | PWRC |
| 5907 | NT | Nedtrain | | NL | VKM |
| 5908 | NTA | Northern Thunderbird Air Ltd. | Callsign: Thunderbird, Designator 4R recalled by IATA | CDN | AVCODES |
| 5909 | NTA | Northern Thunderbird Air Ltd. d/b/a N.T. Air | IATA: 4R, Callsign: Thunderbird, Designator 4R recalled by IATA | CDN | AVCODES |
| 5910 | NTA | Northern Thunderbird Air | | | ICAO1 |
| 5911 | NTAB | NITERIDER TECHNICAL LIGHTING SYSTEM | | | SCAC4 |
| 5912 | NTAB | Nordiska Tåg AB | | SE | VKM |
| 5913 | NTAC | NEW-TRONICS ANTENNA CORP | | | SCAC4 |
| 5914 | NTAE | NOLAN TRANSPORTATION AGENCIES LTD | | | SCAC4 |
| 5915 | NTAF | NORTHWESTERN TRANSPORTATION & FREIG | | | SCAC3 |
| 5916 | NTAF | NORTH STAR SURFACES LLC | | | SCAC4 |
| 5917 | NTAG | NICHOLSONS TRAVEL AGENCY | | | SCAC3 |
| 5918 | NTAG | NE-TEX AG TRANSPORTATION INC | | | SCAC4 |
| 5919 | NTAH | NTA LTD | | | SCAC3 |
| 5920 | NTAJ | NAQEL TRANSPORT AND INVESTMENT BART | | | SCAC4 |
| 5921 | NTAK | NARWAN TRUCKING INC | | | SCAC4 |
| 5922 | NTAL | NETWORK AMERICA LINES, INC | | | SCAC4 |
| 5923 | NTAN | NORTHSIDE TRANSPORTATION LLC | | | SCAC4 |
| 5924 | NTAP | NORTHERN TRANSPORTATION CO INC | | | SCAC3 |
| 5925 | NTAP | N T A TRANSPORT INC | | | SCAC4 |
| 5926 | NTARG | Miejski Zakład Komunikacji w Nowym Targu | | PL | TRAFFIC |
| 5927 | NTARI | Notari S.r.l. Construzioni Speciali | | I | TRAFFIC |
| 5928 | NTARI | NOTARI S.R.L. | | IT | VKM |
| 5929 | NTAS | NUSTART TRUCKING LLC | | | SCAC4 |
| 5930 | NTAT | NATIONAL TRANSPORTATION INC | | | SCAC3 |
| 5931 | NTAT | NENAD TRUCKING LLC | | | SCAC4 |
| 5932 | NTAU | NT RENTAL APS | | DK | BIC |
| 5933 | NTAY | NOTTOWAY TRANSPORT INC | | | SCAC4 |
| 5934 | NTB | Servicios Aereos del Notre, S.A. de C.V. | Callsign: Servinorte, | MEX | AVCODES |
| 5935 | NTB | Binter Cabo Verde | IATA: 3B, Callsign: Morabeza, Name changed to Transportes Interilhas de Cabo Verde, Sociedade Unipessoal, SA. TICV | CV | AVCODES |
| 5936 | NTB | Transportes Interilhas de Cabo Verde, Sociedade Unipessoal, SA. TICV | IATA: 3B, Callsign: Morabeza, ICAO designator changed to BCV. ICAO callsign changed to Morabest. Name changed from Binter Cabo Verde | CV | AVCODES |
| 5937 | NTB | Servicios Aereos Del Norte | | | ICAO1 |
| 5938 | NTB | Nassauische Touristik Bahn e.V. | Wiesbaden | D | privat-bahn.de |
| 5939 | NTB | NEWTON BUS SERVICE INC | | | SCAC4 |
| 5940 | NTB | Nassauische Touristik-Bahn e.V | | DE | VKM |
| 5941 | NTBA | NORTHWEST TRUCKLOAD SERVICE LTD | | | SCAC4 |
| 5942 | NTBC | NORTHERN BOTTLING COMPANY OF MINOT | | | SCAC3 |
| 5943 | NTBD | NEILS TRANSPORTATION SERVICE LIMITE | | | SCAC4 |
| 5944 | NTBE | NICHES TRANSPORT INC | | | SCAC4 |
| 5945 | NTBG | NORMITA TRUCKING | | | SCAC4 |
| 5946 | NTBI | NATIONWIDE TRANSPORTATION BROKERS I | | | SCAC4 |
| 5947 | NTBK | NATIONWIDE TRANSPORTATION BROKERS I | | | SCAC3 |
| 5948 | NTBK | NORTHERN TIMBER TRUCKING INC | | | SCAC4 |
| 5949 | NTBL | NTB LOGISTICS INC | | | SCAC4 |
| 5950 | NTBQ | NATIONAL TRUCK BROKERAGE | | | SCAC3 |
| 5951 | NTBT | NET TRUCK BROKERS | | | SCAC4 |
| 5952 | NTC | Gibson Aviation | Callsign: Night Chase, | USA | AVCODES |
| 5953 | NTC | Gibson Aviation | | | ICAO1 |
| 5954 | NTC | NORTHERN TRANSIT CO. | | | PWRC |
| 5955 | NTC | Northern Transit Co. | | USA | TRAFFIC |
| 5956 | NTCB | NISON TRANSPORTATION CORPORATION | | | SCAC4 |
| 5957 | NTCC | NELSON TRANS CO & COEUR DALENE MTR | | | SCAC3 |
| 5958 | NTCC | NINE ONE TWO EIGHT-SIX NINE ZERO SI | | | SCAC4 |
| 5959 | NTCD | NISSHIN TRANS CONSOLIDATOR CO LTD | | | SCAC4 |
| 5960 | NTCF | NETCO FREIGHT SYSTEMS | | | SCAC3 |
| 5961 | NTCF | NEWSOMS TRANSPORT CO INC | | | SCAC4 |
| 5962 | NTCG | NTC LOGISTICS LLC | | | SCAC4 |
| 5963 | NTCH | NAUTICAL HAULING INC | | | SCAC3 |
| 5964 | NTCI | NEWPORT COACH INC | | | SCAC3 |
| 5965 | NTCK | NEXTWAY TRUCKING COMPANY | | | SCAC4 |
| 5966 | NTCL | NEXUS TRANSPORTATION LTD | | | SCAC3 |
| 5967 | NTCO | NATIONAL TRANSIT COMPANY | | | SCAC3 |
| 5968 | NTCP | NU-TRANS COMPANIES, INC | | | SCAC3 |
| 5969 | NTCQ | NORMANDY TRANSPORT CO | | | SCAC4 |
| 5970 | NTCR | NICMANDA TRUCKING INC | | | SCAC4 |
| 5971 | NTCT | NATIONAL TRANSIT CORPORATION, THE | | | SCAC3 |
| 5972 | NTCU | NINGBO T-TOWN CONTAINER TECHNOLOGY CO., LTD. | | PRC | BIC |
| 5973 | NTCU | NORTHERN TRANSPORTATION COMPANY, LT | | | SCAC3 |
| 5974 | NTCV | NATIONAL TRAILER CONVOY OF CANADA L | | | SCAC3 |
| 5975 | NTCW | NTC | | | SCAC4 |
| 5976 | NTCX | National Tank Car Co. | 7/1923-4/1938 | | NAKINA |
| 5977 | NTCX | National Tank Car Co. (North American Car Co.) | 8/1920 | | NAKINA |
| 5978 | NTCX | National Tank Car Co. | Apr-38 | | NRHS |
| 5979 | NTCX | NATIONAL TANK CAR CO. (NORTH AMERICAN CAR CO.) | | | PWRC |
| 5980 | NTCZ | NELLO TEER COMPANY | | | PWRC |
| 5981 | NTD | Aero Norte, S.A. de C.V. | | MEX | AVCODES |
| 5982 | NTD | Aero Norte | | | ICAO1 |
| 5983 | NTDB | NATIONAL TRUCKING & DISTRIBUTION IN | | | SCAC3 |
| 5984 | NTDK | NIKS TRANSPORTATION INC | | | SCAC4 |
| 5985 | NTDL | NORTHERN CARTAGE (TRUCK LOAD DIV) | | | SCAC4 |
| 5986 | NTDS | NATIONAL TRANSPORTATION & DISTRIBUT | | | SCAC3 |
| 5987 | NTDV | NISADA TRADING SERVICES | | | SCAC4 |
| 5988 | NTE | Interaire, S.A. de C.V. | Callsign: Intermex, | MEX | AVCODES |
| 5989 | NTE | Interaire | | | ICAO1 |
| 5990 | NTEC | NUTECH SERVICE INC | | | SCAC3 |
| 5991 | NTEI | NINE TWO THREE EIGHT-SEVEN TWO FOUR | | | SCAC4 |
| 5992 | NTEN | NATIONAL TRANSP[ORTATION ENTERPRIZE | | | SCAC3 |
| 5993 | NTEP | NATRON EXPRESS INC | | | SCAC3 |
| 5994 | NTEQ | NATES TRUCKING | | | SCAC3 |
| 5995 | NTEQ | NORTHERN TIMBERLINE EQUIPMENT INC | | | SCAC4 |
| 5996 | NTER | NIGHTTRAIN EXPRESS INC | | | SCAC4 |
| 5997 | NTES | NORTHEASTERN TRANSIT INC | | | SCAC3 |
| 5998 | NTES | NINE ONE ZERO FOUR-THREE SEVEN EIGH | | | SCAC4 |
| 5999 | NTET | NATIONAL ELECTRONIC TRANSIT CORP | | | SCAC3 |
| 6000 | NTET | NINE ONE TWO EIGHT-ZERO TWO ZERO SI | | | SCAC4 |
