| 1 | NHC | Northern Helicopter GmbH | Callsign: Northern, | D | AVCODES |
| 2 | NHC | | | CZ | TRAFFIC |
| 3 | NHCA | NASH-CAN AGENCY CORP | | | SCAC4 |
| 4 | NHCD | NATIONAL HIGHWAY CARRIERS DIRECTORY | | | SCAC3 |
| 5 | NHCF | NORTH HAVEN CARLOADING | | | SCAC3 |
| 6 | NHCF | NORTH COUNTRY FUR | | | SCAC4 |
| 7 | NHCI | NORTHERN ILLINOIS COIN & STAMP INC | | | SCAC4 |
| 8 | NHCL | NICHOLSON & HALL CORPORATION | | | SCAC4 |
| 9 | NHCM | NORSK HYDRO CRUDE MARKETING INC | | | SCAC4 |
| 10 | NHCN | NORTHERN HAULERS CORP. | | | PWRC |
| 11 | NHCO | NEW HAVEN COLONY FARMS LTD | | | SCAC4 |
| 12 | NHCP | NORTH HILL CORPORATION | | | SCAC4 |
| 13 | NHCR | New Hampshire Central R.R., Inc. | added 10/1993; 1/1994; eliminated 4/1995; 7/2000-7/2005 | | NAKINA |
| 14 | NHCR | New Hampshire Central R.R., Inc. | added 10/93; 1/94; eliminated 4/95; 7/2000 | | NRHS |
| 15 | NHCR | NEW HAMPSHIRE CENTRAL RAILROAD, INC. | | | PWRC |
| 16 | NHCR | New Hampshire Central Railroad | | | RSRV |
| 17 | NHCR | NEW HAMPSHIRE CENTRAL RAILROAD INC | | | SCAC4 |
| 18 | NHCS | NEW HORIZONS CHARTER SERVICE | | | SCAC3 |
| 19 | NHCU | MITSUI & CO LTD | | J | BIC |
| 20 | NHCU | NIHON HELIUM INC | | | SCAC4 |
