| 6201 | NTRS | NATIONAL TRANSPORTATION SERVICE INC | | | SCAC3 |
| 6202 | NTRT | NOTTESTAD TRUCKING | | | SCAC4 |
| 6203 | NTRU | ICOOL CHEMICAL CO., LTD. | | PRC | BIC |
| 6204 | NTRX | NTL Transportation Ltd. | added 10/2003; 7/2005 | | NAKINA |
| 6205 | NTRX | NTL Transportation Corp. | added 10/2001; eliminated 10/2003 | | NAKINA |
| 6206 | NTRX | Nortex Refining Co. (Skelly Oil Co.) | 7/1923 | | NAKINA |
| 6207 | NTRX | *SKELLY OIL CO. {NORTEX REFINING CO.] | | | PWRC |
| 6208 | NTRX | +NTL TRANSPORTATION CORP. | | | PWRC |
| 6209 | NTRX | NTL Transportation Corporation | | | RSRV |
| 6210 | NTRX | NTL TRANSPORTATION LTD | | | SCAC4 |
| 6211 | NTRY | Nimishillen & Tuscarawas L.L.C. | added 4/2000; 7/2000-7/2005 | | NAKINA |
| 6212 | NTRY | Nimishillen & Tuscarawas Ry. Co. | added 4/1990; 1/1994; eliminated 4/2000 | | NAKINA |
| 6213 | NTRY | Nimishillen & Tuscarawas Ry. Co. | added 4/90; 1/94; eliminated 4/2000 | | NRHS |
| 6214 | NTRY | Nimishillen & Tuscarawas L.L.C. | added 4/2000; 7/2000 | | NRHS |
| 6215 | NTRY | NIMISHILLEN & TUSCARAWAS RAILWAY CO. | | | PWRC |
| 6216 | NTRY | Nimishillen and Tuscarawas | | | RSRV |
| 6217 | NTRY | NIMISHILLEN & TUSCARAWAS RAILWAY CO | | | SCAC3 |
| 6218 | NTRY | NIMISHILLEN & TUSCARAWAS LLC | | | SCAC4 |
| 6219 | NTS | Cirrus Air, Inc. | Callsign: Nite Star, | USA | AVCODES |
| 6220 | NTS | Cirrus Air | | | ICAO1 |
| 6221 | NTS | Northrail Technical Service GmbH | Hamburg, Kiel | D | privat-bahn.de |
| 6222 | NTS | Northrail technical service GmbH &Co. KA | | DE | VKM |
| 6223 | NTSA | NATION TRANSPORTATION SERVICES INC | | | SCAC4 |
| 6224 | NTSB | NTS TRANSPORTATION SERVICES INC | | | SCAC3 |
| 6225 | NTSC | NELSON TRANSFER & STORAGE COMPANY | | | SCAC3 |
| 6226 | NTSD | NGO TRANSPORTATION SERVICES LLC | | | SCAC4 |
| 6227 | NTSE | NETWORK TRANSPORTATION SERVICES INC | | | SCAC3 |
| 6228 | NTSE | NATIONAL TRANSPORTATION SPECIALISTS | | | SCAC4 |
| 6229 | NTSF | NINE THREE SEVEN FIVE FOUR (93754) | | | SCAC4 |
| 6230 | NTSG | NATTRASS TRUCKING INC | | | SCAC4 |
| 6231 | NTSI | NATIONWIDE TRANSPORTATION SERVICES | | | SCAC3 |
| 6232 | NTSI | NATIONWIDE TRANSPORTATION SERVICES | | | SCAC4 |
| 6233 | NTSJ | NATIONAL TRANSPORT SERVICES LLC | | | SCAC4 |
| 6234 | NTSK | N T S L L C | | | SCAC4 |
| 6235 | NTSL | NATIONAL STEEL CORP (TRANSPORTATION | | | SCAC3 |
| 6236 | NTSM | NTS | | | SCAC3 |
| 6237 | NTSN | NU-TECH SERVICES INC | | | SCAC3 |
| 6238 | NTSN | NINE ZERO ONE TWO-THREE SIX THREE N | | | SCAC4 |
| 6239 | NTSP | NORTHWEST TRANSPORTATION SERVICES I | | | SCAC4 |
| 6240 | NTSQ | NATRONA TRANSFER & STORAGE | | | SCAC3 |
| 6241 | NTSQ | NINE ZERO TWO FOUR-SEVEN FIVE EIGHT | | | SCAC4 |
| 6242 | NTSR | N E T TRANSPORTATION SERVICES INC | | | SCAC3 |
| 6243 | NTSS | NEWAYNE TRANSPORT | | | SCAC3 |
| 6244 | NTST | NATIONAL TRANSIT INC | | | SCAC3 |
| 6245 | NTST | NAVCOR TRANSPORTATION SERVICES INC | | | SCAC4 |
| 6246 | NTSU | NORTHERN TRANSPORTATION COMPANY, LT | | | SCAC3 |
| 6247 | NTSU | NORTHERN TRANSPORTATION COMPANY LTD | | | SCAC4 |
| 6248 | NTSW | NATIONAL TRANSPORTATION SERVICES IN | | | SCAC4 |
| 6249 | NTSX | NTL Transportation Ltd. | added 1/2009 | | NAKINA |
| 6250 | NTSX | Northeast Transportation Service, Inc. | 1/1994; eliminated 10/1996 | | NAKINA |
| 6251 | NTSX | Northeast Transportation Services, Co. | added 4/1988 | | NAKINA |
| 6252 | NTSX | Northeast Transportation Services, Co. | added 4/88 | | NRHS |
| 6253 | NTSX | Northeast Transportation Service, Inc. | 1/94; eliminated 10/96 | | NRHS |
| 6254 | NTSX | NORTHEAST TRANSPORTATION SERVICES, INC. | | | PWRC |
| 6255 | NTSX | NTL TRANSPORTATION LTD | | | SCAC4 |
| 6256 | NTT | Inter Tropic Airlines (S.L.) Ltd. | Callsign: Inter-Tropic, | WAL | AVCODES |
| 6257 | NTT | Inter Tropic Airlines | | | ICAO1 |
| 6258 | NTTA | NORTON TRANSPORT INC | | | SCAC3 |
| 6259 | NTTB | NINE ZERO THREE TWO- SEVEN FIVE SIX | | | SCAC4 |
| 6260 | NTTD | NATIONAL TANK TRUCK DELIVERY INC. | | | PWRC |
| 6261 | NTTE | NINE TWO TWO NINE-ONE EIGHT THREE Z | | | SCAC4 |
| 6262 | NTTF | NINE ONE TWO T | | | SCAC4 |
| 6263 | NTTG | NORRIS, TERRY TRUCKING INC | | | SCAC3 |
| 6264 | NTTH | NORTH TERRACE TRANSFER LLC | | | SCAC4 |
| 6265 | NTTJ | NEUBAUER, TIM TRUCKING LLC | | | SCAC4 |
| 6266 | NTTK | NATES TRUCKING INC | | | SCAC3 |
| 6267 | NTTK | NIGHT TRAIN TRUCKING INC | | | SCAC4 |
| 6268 | NTTN | N T TRANSPORT INC | | | SCAC4 |
| 6269 | NTTQ | NINE ONE FOUR THREE-EIGHT SIX SIX T | | | SCAC4 |
| 6270 | NTTR | NIGHT TRAIN INC | | | SCAC3 |
| 6271 | NTTR | NINE ZERO TWO NINE-THREE ONE FIVE O | | | SCAC4 |
| 6272 | NTTS | NATIONAL TELE-TRUCK SYSTEMS INC | | | SCAC4 |
| 6273 | NTTU | NANTONG TANK CONTAINER CO, LTD | | PRC | BIC |
| 6274 | NTTU | NANTONG TANK CONTAINER CO LTD | | | SCAC4 |
| 6275 | NTTV | NINE TWO TWO ZERO-ONE SIX SIX FOUR | | | SCAC4 |
| 6276 | NTTW | NINE TWO TWO ZERO-FIVE TWO FOUR FOU | | | SCAC4 |
| 6277 | NTTX | TTX Co. | added 1/1992; 1/1994-7/2005 | | NAKINA |
| 6278 | NTTX | Trailer Train Co. | added 10/1986; eliminated 1/1992 | | NAKINA |
| 6279 | NTTX | Trailer Train Co./TTX Co. (skeletonized, 5-unit, articulated, single-stack COFC car) | added 10/1986; 10/1991-7/2000 | | NAKINA |
| 6280 | NTTX | Trailer Train Co. | added 10/86; eliminated 1/92 | | NRHS |
| 6281 | NTTX | TTX Co. | added 1/92 | | NRHS |
| 6282 | NTTX | TTX Co. (skeletonized, 5-unit, articulated, single-stack COFC car) | 1/94-7/2000 | | NRHS |
| 6283 | NTTX | TTX COMPANY | | | PWRC |
| 6284 | NTTX | Trailer Train (TTX Corporation) | | | RSRV |
| 6285 | NTTX | TTX COMPANY | | | SCAC4 |
| 6286 | NTTY | NISTLER, TONY TRUCKING | | | SCAC4 |
| 6287 | NTU | Century Aviation (Nig) Ltd. | Callsign: Centurion, | WAN | AVCODES |
| 6288 | NTUE | NATUREBEST PRE CUT & PRODUCE LLC | | | SCAC4 |
| 6289 | NTUG | NORFOLK TUG CO INC | | | SCAC4 |
| 6290 | NTUR | NATURE TRANSPORT | | | SCAC4 |
| 6291 | NTUS | NATIONAL TOUR SERVICES INC | | | SCAC3 |
| 6292 | NTUT | NATURAL TRANSPORTATION INC | | | SCAC3 |
| 6293 | NTV | Air Inter Ivoire | Callsign: Inter-Ivoire, Founded and commenced operations in 1978. Ceased operations in 1979. | CI | AVCODES |
| 6294 | NTV | Air Inter Ivoire | | | ICAO1 |
| 6295 | NTV | Nuovo Transporto Viaggiatori S.p.A. \'\'NTV\'\' | | IT | VKM |
| 6296 | NTVC | NATIONAL TRANSPORTATION SERVICES IN | | | SCAC4 |
| 6297 | NTVF | NATIVE FUELS | | | SCAC4 |
| 6298 | NTVL | NITE VALLEY TRANSPORT | | | SCAC3 |
| 6299 | NTVS | NATIONAL TRAVEL SERVICE | | | SCAC3 |
| 6300 | NTVY | NORMANDIN TRANSPORTATION SERVICES I | | | SCAC4 |
