| 1 | NAD | Seulawah Nad Air | Callsign: Seulawah, | RI | AVCODES |
| 2 | NAD | Al Naser Wings Airlines | IATA: NG, Callsign: Naser Wings, Ceased operations on 16 April 2019. | IRQ | AVCODES |
| 3 | NAD | Noble Air | IATA: HK, Callsign: Nobleair, Ceased opeations at the end of 1991. | TR | AVCODES |
| 4 | NAD | Seulawah Nad Air | | | ICAO1 |
| 5 | NADC | NEW AGE DELIVERY COMPANY | | | SCAC4 |
| 6 | NADG | NADEAU, GASTON | | | SCAC3 |
| 7 | NADH | NORTH AMERICAN THOUROUGHBRED HORSE | | | SCAC4 |
| 8 | NADI | NORTH AREA DELIVERY AND WAREHOUSE C | | | SCAC3 |
| 9 | NADJ | NADEAUS, JOSEPH SONS INC | | | SCAC3 |
| 10 | NADL | NADELL & CO INC | | | SCAC4 |
| 11 | NADM | NORDIC AMERICAN SHIPPING INC. | | | SCAC3 |
| 12 | NADQ | NATIONAL DISTRIBUTION SYSTEM | | | SCAC3 |
| 13 | NADU | NORTH AMERICAN DOMESTIC CONTAINER COPR. [(REDZ) REDON, INC.] | | | PWRC |
| 14 | NADU | North American Domestic Container Corporation | | | RSRV |
| 15 | NADU | REDON, INC. | | | SCAC3 |
| 16 | NADX | General Electric Rail Services Corp. | added 1/2000; 7/2000-7/2005 | | NAKINA |
| 17 | NADX | General Electric Railcar Services Corp. | added 1/1984; 1/1994; eliminated 1/2000 | | NAKINA |
| 18 | NADX | North American Despatch (North American Car Corp.) | 4/1970-1/1980; eliminated 1/1984 | | NAKINA |
| 19 | NADX | North American Car Corp. | 10/1966 | | NAKINA |
| 20 | NADX | North American Despatch (North American Car Corp.) | 7/1937-7/1965 | | NAKINA |
| 21 | NADX | North American Car Corp. | 7/1930-7/1935 | | NAKINA |
| 22 | NADX | North American Car Corp. | Apr-38 | | NRHS |
| 23 | NADX | North American Despatch (North American Car Corp.) | 1/52-7/65 | | NRHS |
| 24 | NADX | North American Car Corp. | Oct-66 | | NRHS |
| 25 | NADX | North American Despatch (North American Car Corp.) | 4/70-1/80 | | NRHS |
| 26 | NADX | General Electric Railcar Services Corp. | 1/94; eliminated 1/2000 | | NRHS |
| 27 | NADX | General Electric Rail Services Corp. | added 1/2000; 7/2000 | | NRHS |
| 28 | NADX | (NATX) GE RAIL SERVICES CORPORATION [NO. AMER. DOMESTIC CONTAINER CORP] | | | PWRC |
| 29 | NADX | North American Domestic Container Corporation (GE Rail Services) | | | RSRV |
| 30 | NADX | NORTH AMERICAN CAR CORP | | | SCAC3 |
| 31 | NADX | GENERAL ELECTRIC RAILCAR SERVICES C | | | SCAC4 |
| 32 | NADY | NADY EXPRESS COMPANY INC | | | SCAC3 |
| 33 | NADZ | NORTH AMERICAN DOMESTIC CONTAINER COPR. [(REDZ) REDON, INC.] | | | PWRC |
| 34 | NADZ | North American Domestic Container Corporation | | | RSRV |
| 35 | NADZ | NORTH AMERICAN DOMESTIC CONTAINER C | | | SCAC4 |
