Ozark Air Lines began public operation in the US in 1950, operating from their headquarters located at Lambert–St. Louis Municipal Airport. Ozark purchased Douglas DC-3s from the defunct Parks Airline with regular flights between St. Louis and Chicago, including short hops along the way, and to Tulsa and Memphis. By 1955, the airline used its thirteen DC-3s to serve thirty-five cities between Sioux City, Indianapolis, Wichita, and Nashville. By 1960, turboprop Fairchild F-27s (above) replaced the aging DC-3s with its first Douglas DC-9-10 jets introduced in 1966. Ozark Airlines was unable to compete in the airline price wars and in 1986 was purchased by Trans World Airlines, itself unable to sustain profitability and was purchased by American Airlines in 2001.
Note: The three swallows in Ozark's logo represented on-time flights, referring to the legend of the swallows that return to the Mission San Juan Capistrano, in California each year.