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- Key Airlines
- Key West Airlines (1980 - 1988)
- Kitty Hawk Airways (1978)
- Kitty Hawk International (? - 2000, to Kalitta Air)
- Kiwi International Air Lines (1992 - 1999)
Read more about this topic: List Of Defunct Airlines Of The United States
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Read more about this topic: List Of Defunct Airlines Of The United States