| 1 | NIT | Midwest Aviation Corp. | Callsign: Nighttrain, | USA | AVCODES |
| 2 | NIT | Middle Georgia State College | Callsign: Nighttrain, | USA | AVCODES |
| 3 | NIT | Midwest Aviation | | | ICAO1 |
| 4 | NIT | Neuss Intermodal Terminal GmbH | Neuss | D | privat-bahn.de |
| 5 | NITC | NO IDLE TRANSPORT | | | SCAC4 |
| 6 | NITE | NITEOWL TRANSPORTATION | | | SCAC4 |
| 7 | NITI | N I T INC | | | SCAC3 |
| 8 | NITM | NIC-O-TIME INC | | | SCAC3 |
| 9 | NITN | NITTANY OIL COMPANY | | | SCAC4 |
| 10 | NITO | NITE OIL CO | | | SCAC4 |
| 11 | NITP | NIGHT STAR TRANSPORT | | | SCAC4 |
| 12 | NITQ | NEITZ, CHARLES W | | | SCAC3 |
| 13 | NITR | NITCHER TRUCKING | | | SCAC3 |
| 14 | NITR | NITCHER TRUCKING | | | SCAC4 |
| 15 | NITRO | Zakłady Chemiczne “NITRO-CHEM” S.A. | | PL | VKM |
| 16 | NITS | NIEDERBRACH TRUCK SERVICE, INC | | | SCAC3 |
| 17 | NITU | LLC NUNIT | | UA | BIC |
| 18 | NITX | Nitram Inc. | added 7/1979; 1/1980-1/1994; eliminated 1/1995; added 10/1996; eliminated 1/1997 | | NAKINA |
| 19 | NITX | Nitram Inc. | added 7/79; 1/80-1/94; eliminated 1/95; added 10/96; eliminated 1/97 | | NRHS |
| 20 | NITX | NITRAM, INC. | | | PWRC |
| 21 | NITX | Nitram | | | RSRV |
| 22 | NITX | VIRGINIA INTERNATIONAL TERMINALS IN | | | SCAC4 |
| 23 | NITZ | NORFOLK INTERNATIONAL TERMINAL | | | PWRC |
