| 6101 | NTLI | NATIONAL LOGISTICS INC | | | SCAC4 |
| 6102 | NTLK | NOAHS TRANSPORTATION LLC | | | SCAC4 |
| 6103 | NTLL | NUSTAR TRUCK LINES LTD | | | SCAC3 |
| 6104 | NTLL | NEW TRANS LOGISTICS LLC | | | SCAC4 |
| 6105 | NTLM | NATIONAL MOVING & STORAGE INC | | | SCAC3 |
| 6106 | NTLN | NATIONAL TRANSPORTATION | | | SCAC4 |
| 6107 | NTLO | N T & L | | | SCAC4 |
| 6108 | NTLP | NTL INC | | | SCAC3 |
| 6109 | NTLP | NKARGO TRUCKING LLC | | | SCAC4 |
| 6110 | NTLQ | NATIONAL MOTOR FREIGHT | | | SCAC3 |
| 6111 | NTLQ | NATIONAL MOTOR FREIGHT | | | SCAC4 |
| 6112 | NTLR | NATIONAL TRAILER REPAIR | | | SCAC3 |
| 6113 | NTLR | NORTHERN LITE MFG LTD | | | SCAC4 |
| 6114 | NTLS | NEVADA TRUCK LINES INC | | | SCAC3 |
| 6115 | NTLS | NATIONWIDE TRANSPORTATION AND LOGIS | | | SCAC4 |
| 6116 | NTLT | NATIONAL TRUCKING COMPANY | | | SCAC3 |
| 6117 | NTLU | NANTAI LINE CO. LTD. | | | SCAC3 |
| 6118 | NTLX | O.E. Linsin, Inc. | added 7/1954; 7/1954; eliminated 10/1954 | | NAKINA |
| 6119 | NTLX | Nashtex Leasing Inc. | 1/1994-7/2005 | | NAKINA |
| 6120 | NTLX | Northern Tank Line Inc. | 1/1946-1/1952; eliminated 7/1954 | | NAKINA |
| 6121 | NTLX | Northern Tank Line Inc. | Jan-52 | | NRHS |
| 6122 | NTLX | Nashtex Leasing Inc. | 1/94-7/2000 | | NRHS |
| 6123 | NTLX | *O.E. LINSIN, INC. [NORTHERN TANK LINE INC.} | | | PWRC |
| 6124 | NTLX | +NASHTEX LEASING INCORPORATED | | | PWRC |
| 6125 | NTLX | Nashtex Leasing | | | RSRV |
| 6126 | NTLX | NASHTEX LEASING INCORPORATED | | | SCAC4 |
| 6127 | NTLY | NATIVE TRAILS LLC | | | SCAC4 |
| 6128 | NTM | North American Airlines Ltd. | Callsign: Northam, | USA | AVCODES |
| 6129 | NTM | North American Airlines | | | ICAO1 |
| 6130 | NTMB | NORTHEAST TIMBER INC | | | SCAC4 |
| 6131 | NTMD | NORTRUCK MANUFACTURING AND DIST LTD | | | SCAC4 |
| 6132 | NTMO | NIGHT MOVES INC | | | SCAC3 |
| 6133 | NTMV | NATIONAL MOVING & STORAGE OF COLORA | | | SCAC3 |
| 6134 | NTN | NAC Aviation Business Centre (PTY) Ltd. d/b/a National Airlines | IATA: YJ, Callsign: Natchair, Designator YJ recalled by IATA | ZA | AVCODES |
| 6135 | NTN | NAC Aviation Business Centre (PTY) Ltd. d/b/a National Airlines | Callsign: Natchair, Designator YJ recalled by IATA | ZA | AVCODES |
| 6136 | NTNB | NORTON, B W MFG CO INC | | | SCAC3 |
| 6137 | NTND | NTN TRUCKING LTD | | | SCAC4 |
| 6138 | NTNH | NORTHSTAR TOURS OF NEW HAMPSHIRE | | | SCAC3 |
| 6139 | NTNI | NINE ZERO ONE TWO- NINE SEVEN FIVE | | | SCAC4 |
| 6140 | NTNL | NINE ZERO THREE SIX-FIVE TWO SIX TH | | | SCAC4 |
| 6141 | NTNP | NATION TO NATION PREMIUM CEDAR | | | SCAC4 |
| 6142 | NTNT | NEWTON TRANSPORTATION INC | | | SCAC3 |
| 6143 | NTNU | NATIONAL CONTAINER NETWORK, INC. | | | PWRC |
| 6144 | NTNU | National Container Network | | | RSRV |
| 6145 | NTNU | NATIONAL CONTAINER NETWORK | | | SCAC3 |
| 6146 | NTO | Aero Centro, S.A. de C.V. | Callsign: Centroaero, | MEX | AVCODES |
| 6147 | NTOD | NIGHT OWL DISTRIBUTION | | | SCAC4 |
| 6148 | NTOF | NINE TWO ONE EIGHT-SIX ONE ZERO FIV | | | SCAC4 |
| 6149 | NTOG | NITRO LOGISTICS | | | SCAC4 |
| 6150 | NTOG | Norke tog AS | Real: NOR | N | TRAFFIC |
| 6151 | NTOL | NUSSEY TRANSPORT LTD | | | SCAC3 |
| 6152 | NTON | NATIONS TRANSPORT CORPORATION | | | SCAC3 |
| 6153 | NTON | NINE ZERO TWO ONE-ZERO FIVE EIGHT F | | | SCAC4 |
| 6154 | NTOO | NINE ONE TWO FIVE-ONE T | | | SCAC4 |
| 6155 | NTOP | NETOP TOURS INC | | | SCAC3 |
| 6156 | NTOQ | NINE TWO ONE THREE-ZERO EIGHT THREE | | | SCAC4 |
| 6157 | NTOU | NARVATANK LTD | | EST | BIC |
| 6158 | NTOW | NATIONAL TOWING SERVICE INC | | | SCAC3 |
| 6159 | NTOW | NAVI-TREK (OVERSEAS) INC | | | SCAC4 |
| 6160 | NTOY | NESTE OY | | | SCAC3 |
| 6161 | NTOY | NESTE OY | | | SCAC4 |
| 6162 | NTP | Nistransair | Callsign: Nistransair, | MD | AVCODES |
| 6163 | NTP | NITROPOROS SRL | | RO | VKM |
| 6164 | NTPB | NATIONAL TRANSPORTATION BROKERS INC | | | SCAC3 |
| 6165 | NTPC | NATIONAL TRANSPORTATION CORP | | | SCAC3 |
| 6166 | NTPD | NATIONAL TRANSPORTATION DISTRIBUTIO | | | SCAC3 |
| 6167 | NTPE | NATIVE PRIDE | | | SCAC4 |
| 6168 | NTPL | NORMAN TRANSPORTATION LINES INC | | | SCAC3 |
| 6169 | NTPL | NT SPECIALTIES | | | SCAC4 |
| 6170 | NTPO | NATIONAL TRANSPORT INC | | | SCAC4 |
| 6171 | NTPQ | NOEL TRANSFER & PACKAGE DELIVERY SE | | | SCAC3 |
| 6172 | NTPR | NORTHSTATE PROPANE | | | SCAC3 |
| 6173 | NTPT | NELSON, T P TRUCKING | | | SCAC3 |
| 6174 | NTQB | NINE ONE SIX THREE-TWO SIX FOUR SIX | | | SCAC4 |
| 6175 | NTR | TNT International Aviation | Callsign: Nitro, | GB | AVCODES |
| 6176 | NTR | SAS Natireva t/a Air Moana | IATA: NM, | PF | AVCODES |
| 6177 | NTR | TNT International Aviation | | | ICAO1 |
| 6178 | NTR | Mississippi Central R.R. Co. | added 4/1994; 7/2000; eliminated 10/2001; 7/2005 | | NAKINA |
| 6179 | NTR | Natchez Trace R.R. | added 4/1982; 1/1994; eliminated 4/1994 | | NAKINA |
| 6180 | NTR | Natchez Trace R.R. | added 4/82; 1/94; eliminated 4/94 | | NRHS |
| 6181 | NTR | Mississippi Central R.R. Co. | added 4/94; 7/2000 | | NRHS |
| 6182 | NTR | (MSCI) MISSISSIPPI CENTRAL RAILROAD CO. [NATCHEZ TRACE RR] | | | PWRC |
| 6183 | NTR | Natchez Trace Railroad (Mississippi Central Railroad) | | | RSRV |
| 6184 | NTRA | NORTHERN TRANSPORT INC | | | SCAC3 |
| 6185 | NTRA | NATIONAL TRUCKERS ALLIANCE | | | SCAC4 |
| 6186 | NTRB | NORTHERN TRAVEL BUREAU | | | SCAC3 |
| 6187 | NTRC | NATIONAL RECYCLING CORP | | | SCAC4 |
| 6188 | NTRD | NAPLES TRANSPORT | | | SCAC4 |
| 6189 | NTRE | NOTRE LINES INC | | | SCAC3 |
| 6190 | NTRE | NORTHERN TRAILER | | | SCAC4 |
| 6191 | NTRG | NATIONAL TRUCKING INC | | | SCAC3 |
| 6192 | NTRG | NOVA TRANSPORT | | | SCAC4 |
| 6193 | NTRI | NEWMAN TRUCKING INC | | | SCAC3 |
| 6194 | NTRL | NORMANS TRANSFER LIMITED | | | SCAC3 |
| 6195 | NTRM | NEUMANN TRUCKING | | | SCAC4 |
| 6196 | NTRN | NASH TRUCKING | | | SCAC3 |
| 6197 | NTRO | NITRO EXPRESS CORPORATION | | | SCAC4 |
| 6198 | NTRP | NEW (TRANS) PORT INC | | | SCAC3 |
| 6199 | NTRQ | NILE TRANSPORT | | | SCAC4 |
| 6200 | NTRR | NIGHTRUNNERS TRANSPORT LTD | | | SCAC4 |
