| 1 | NAC | Northern Air Cargo, Inc. | IATA: NC, Callsign: Yukon, IATA Prefix: 345, ICAO callsign changed from Northern Air Cargo. Name changed to Northern Air Cargo, LLC. | USA | AVCODES |
| 2 | NAC | Northern Air Cargo, Inc. | IATA: NC, Callsign: Northern Air Cargo, IATA Prefix: 345, ICAO callsign changed to Yukon | USA | AVCODES |
| 3 | NAC | Northern Air Cargo, LLC. | IATA: NC, Callsign: Yukon, IATA Prefix: 345, ICAO callsign changed from Northern Air Cargo. Name changed from Northern Air Cargo, Inc. | USA | AVCODES |
| 4 | NAC | Northern Air Cargo | IATA: NC | | ICAO1 |
| 5 | NAC | NASHVILLE & ASHLAND CITY RAILROAD CO. | | | PWRC |
| 6 | NACA | NATIONAL CARTAGE CO | | | SCAC3 |
| 7 | NACB | NORTH AMERICAN CARIBBEAN LINE LTD. | | | SCAC3 |
| 8 | NACB | National Coal Board | Real: NCB | GB | TRAFFIC |
| 9 | NACC | NORTH AMERICAN CAR CO. | | | PWRC |
| 10 | NACCO | NACCO SAS | | F | TRAFFIC |
| 11 | NACCO | NACCO GmbH | | DE | VKM |
| 12 | NACD | NORTH AMERICAN CARGO SERVICES INC | | | SCAC4 |
| 13 | NACE | NARROWS CARRIERS INC | | | SCAC3 |
| 14 | NACE | NORTH AMERICAN COMPOSITES DIV OF IN | | | SCAC4 |
| 15 | NACG | NATIONAL AIR CARGO GROUP INC | | | SCAC4 |
| 16 | NACH | NA-CHURS TRANSPORTATION INC | | | SCAC3 |
| 17 | NACI | NACAL, INC | | | SCAC3 |
| 18 | NACI | NACAL INC | | | SCAC4 |
| 19 | NACJ | NATIONAL CARGO INC | | | SCAC3 |
| 20 | NACK | N & C KOHLIG INC | | | SCAC3 |
| 21 | NACL | NACKE, CLETUS TRUCK LINE INC | | | SCAC3 |
| 22 | NACM | NORTH AMERICAN COMPENDIUMS LTD | | | SCAC4 |
| 23 | NACO | NATICK CITGO | | | SCAC3 |
| 24 | NACP | NORTH AMERICAN CARRIERS | | | SCAC4 |
| 25 | NACQ | NATIONAL AIR CARGO INC | | | SCAC4 |
| 26 | NACR | Nashville & Ashland City R.R. | added 1/1982; eliminated 10/1987; eliminated 7/1989; 1/1994-7/2005 | | NAKINA |
| 27 | NACR | Nashville & Ashland City R.R. | added 1/82; eliminated 10/87; eliminated 7/89; 1/94-7/2000 | | NRHS |
| 28 | NACR | NASHVILLE & ASHLAND CITY RAILROAD | | | PWRC |
| 29 | NACR | Nashville and Ashland City Railroad | | | RSRV |
| 30 | NACR | NASHVILLE & ASHLAND CITY RAILROAD | | | SCAC3 |
| 31 | NACS | NATIONAL COURIER SYSTEMS INC | | | SCAC3 |
| 32 | NACS | NEW ACTIVITY SHIPPING INC | | | SCAC4 |
| 33 | NACT | NATIONAL CITY TRANSFER & STORAGE | | | SCAC3 |
| 34 | NACT | NATIONAL CITY TRANSFER & STORAGE | | | SCAC4 |
| 35 | NACU | NALCO LIMITED | | | SCAC4 |
| 36 | NACV | NOBLE AMERICAS CORP | | | SCAC4 |
| 37 | NACW | NATIONAL COACH WORKS INC | | | SCAC3 |
| 38 | NACX | General Electric Rail Services Corp. | added 1/2000; 7/2000-7/2005 | | NAKINA |
| 39 | NACX | North American Chemical Co. | added 4/1991; eliminated 10/1991 | | NAKINA |
| 40 | NACX | General Electric Railcar Services Corp. | added 10/1991; 1/1994; eliminated 1/2000 | | NAKINA |
| 41 | NACX | North American Car Corp. | added 1/1976; eliminated 10/1979 | | NAKINA |
| 42 | NACX | Hooker Chemical Corp. | 4/1970; eliminated 4/1971 | | NAKINA |
| 43 | NACX | Niagara Alkali Co. (Hooker Chemical Corp.) | 10/1966 | | NAKINA |
| 44 | NACX | Hooker Chemical Corp. | added 10/1958; 4/1961-7/1965 | | NAKINA |
| 45 | NACX | Hooker Electrochemical Co. | 10/1957; eliminated 10/1958 | | NAKINA |
| 46 | NACX | Hooker Chemical Corp. | added 7/1956 | | NAKINA |
| 47 | NACX | Niagara Alkali Co. | 8/1920-7/1954; eliminated 7/1956 | | NAKINA |
| 48 | NACX | Niagara Alkali Co. | 4/38-1/52; eliminated 7/56 | | NRHS |
| 49 | NACX | Hooker Chemical Corp. | added 7/56 | | NRHS |
| 50 | NACX | Hooker Electrochemical Co. | 10/57; eliminated 10/58 | | NRHS |
| 51 | NACX | Hooker Chemical Corp. | added 10/58; 4/61-7/65 | | NRHS |
| 52 | NACX | Niagara Alkali Co. (Hooker Chemical Corp.) | Oct-66 | | NRHS |
| 53 | NACX | Hooker Chemical Corp. | 4/70; eliminated 4/71 | | NRHS |
| 54 | NACX | North American Chemical Co. | added 4/91; eliminated 10/91 | | NRHS |
| 55 | NACX | General Electric Railcar Services Corp. | added 10/91; 1/94; eliminated 1/2000 | | NRHS |
| 56 | NACX | General Electric Rail Services Corp. | added 1/2000; 7/2000 | | NRHS |
| 57 | NACX | *HOOKER CHEMICAL CORP. [NIAGARA ALKALI CO.] | | | PWRC |
| 58 | NACX | +(NATX) GENERAL ELECTRIC RAIL SERVICES CORPORATION | | | PWRC |
| 59 | NACX | Niagara Alkali Co. (GE Rail Services) | | | RSRV |
| 60 | NACX | GENERAL ELECTRIC RAILCAR SERVICES C | | | SCAC4 |
| 61 | NACZ | NORTHWEST ALLOY COMPANY | | | PWRC |