| 1 | NAN | National Airlines, Inc. | IATA: N7, Callsign: Nation Air, IATA Prefix: 007, Ceased operations on 06 November 2002. | USA | AVCODES |
| 2 | NAN | Norwegian Air Norway AS | IATA: DH, Callsign: Norship, | N | AVCODES |
| 3 | NAN | National Airlines | | | ICAO1 |
| 4 | NAN | Nankai Electric Railway Co., Ltd. | | J | TRAFFIC |
| 5 | NANA | NATIONAL NICKEL ALLOY CORP | | | SCAC3 |
| 6 | NANB | NOVEDADES ANEL | | | SCAC4 |
| 7 | NANBU | Nanbu Bus | | J | TRAFFIC |
| 8 | NANC | NANCE AND COLLUMS, INC | | | SCAC3 |
| 9 | NANCY | Service de transport de l'agglomération nancéienne | Real: STAN, City: Nancy, The company managed public transport networks in several French cities. | F | TRAFFIC |
| 10 | NANGOK | Nangoku Kotsu | City: Kagoshima | J | TRAFFIC |
| 11 | NANJ | Nanjing Metro | | PRC | TRAFFIC |
| 12 | NANM | NATIONAL MOVERS CORPORATION | | | SCAC3 |
| 13 | NANSYUB | Nansyu Bus | | J | TRAFFIC |
| 14 | NANU | NAVIERA LAVINEL | | | SCAC3 |
| 15 | NANX | National Aniline Division, Allied Chemical Corp. | added 7/1958; 4/1961; eliminated 7/1964 | | NAKINA |
| 16 | NANX | National Aniline Division, Allied Chemical & Dye Corp. | 1/1952-10/1957; eliminated 7/1958 | | NAKINA |
| 17 | NANX | National Aniline Division, Allied Chemical & Dye Corp. | 1/52-10/57; eliminated 7/58 | | NRHS |
| 18 | NANX | National Aniline Division, Allied Chemical Corp. | added 7/58; 4/61; eliminated 7/64 | | NRHS |
| 19 | NANX | NATIONAL ANALINE DIV., ALLIED CHEMICAL CORP. | | | PWRC |
| 20 | NANY | NANCY TRANSPORTATION INC | | | SCAC3 |
