T
- TAG Airlines (c. 1957 - 1970)
- Tahoe Air (1999)
- Tamir Transport (? - 1971)
- TAT - Maddux Air Lines (1928 - 1930, to Transcontinental & Western Air)
- Ted (2003 - 2009) (operations merged back into parent company United Airlines)
- Tempelhof Airways (1981 - 1990)
- Tennessee Airways (1978 - 1987)
- Texas Air
- Texas Trans Air
- Texas International Airlines (1944 - 1986, to Continental Airlines)
- The Hawaii Express (1982 - 1983)
- Tower Air (1983 - 2000)
- Trans Air (1979 -1985)
- Transamerica Airlines (1948 - 1986)
- Trans-California Airlines
- Trans-Central Airlines
- Transcontinental Air Transport (1928 - 1929, merged with Maddux Air Lines)
- TransMeridian Airlines (1995 - 2005)
- Transocean Airlines (1946-1962)
- Trans Ocean Airways (1979 - 1990)
- Trans International Airlines (1947 - 1986)
- TranStar Airlines (1981 - 1987)
- Trans-Colorado Airlines (1980 - 1987)
- Trans-Texas Airways (TTa, 1947 - 1969, to Texas International Airlines)
- Trans World Airlines (1930 - 2001, to American Airlines)
- Trans World Express (? - 1995)
- Trump Shuttle (1989 - 1991, to USAir Shuttle)
Read more about this topic: List Of Defunct Airlines Of The United States