N
- National Airlines (1929 - 1980, to Pan American World Airways)
- National Airlines (1983 - 1986)
- National Airlines/Private Jet Expeditions (1994 - 1995)
- National Airlines (1999 - 2002)
- National Air Transport Inc (1926 - 1930)
- Nations Air Express (1994-1998)
- Nationwide Airlines Southeast
- New England & Western Air Transportation Co. (1930)
- New York Air (1980 - 1986, to Continental Airlines)
- New York Airways (1949 - 1979)
- New York, Rio, and Buenos Aires Line (to Pan American World Airways)
- North Central Airlines (1939 - 1979)(merged with Southern Airways to become Republic)
- Northcoast Executive Airlines (1990 - 1991)
- Northeast Airlines (1940 - 1970)
- Northeastern International Airways (1980 - 1986)
- Northwest Airlines (1927 - 2010, to Delta Air Lines)
Read more about this topic: List Of Defunct Airlines Of The United States