Ozark Airlines Ozark Air Lines was an airline that operated in the United States from 1950 until 1986 when it was purchased by Trans World Airlines. In 2001, TWA was merged into American Airlines. A smaller regional airline that used the Ozark name operated in 2000–2001. From Wikipedia A great small airline. Friendly staff and back in the days when you got an actual meal and the whole can of soda and cheap to fly.