mutual consent due to financing difficulties. By 1967, the Martins and F-27s were replaced with Fairchild Hiller FH-227s, a stretched F-27; Ozark was all-turbine after the last DC-3 flight in October 1968. Ozark's introduced its first jets in July, 1966 with the Douglas DC-9-10s. The DC-9-10s were later augmented with McDonnell Douglas DC-9-30s (DC-9-31/32) and McDonnell Douglas DC-9-40s. The airline also ordered two Boeing 727-200s but never took delivery. In late 1980, Ozark retired its last FH-227 prop aircraft and went all jet with an all DC-9 fleet. Several very small cities including Burlington, Fort Dodge, and Mason City in Iowa, Decatur, Marion, and Quincy in Illinois, and Cape Girardeau, Missouri, briefly saw DC-9 jet service before Ozark discontinued serving those cities in 1982. In 1984, larger McDonnell Douglas MD-80s were added. Ozark Midwest In 1985 Ozark began a code-share agreement with Air Midwest, a commuter airline operating 17-seat Fairchild Swearingen Metroliners. The operation was called Ozark Midwest and the Air Midwest aircraft were painted with green stripes, similar to Ozark but without the swallows. Ozark Midwest provided feeder service to Ozark from many smaller cities in the midwest that were not able to support large DC-9 jets including several cities that Ozark had previously discontinued. Merger with TWA In the mid-1980s Ozark and TWA had a de facto duopoly at St. Louis Lambert International Airport, a hub for both. Ozark accounted for 26.3 percent of boardings at STL in 1985, while TWA accounted for 56.6 percent. On , the two airlines announced plans to merge: TWA would buy Ozark for million in cash (equivalent to million in ). Shareholders of both airlines approved the merger by late summer, and the United States Department of Transportation gave its approval on . Ozark ceased to exist as an independent company on . The Ozark DC-9s were gradually painted with a modified paint scheme with "TWA" in the tail. Over the next couple of years, the fifty Ozark airplanes were repainted in the TWA livery. On , TWA was merged into American Airlines. Second Ozark Air Lines (2000–2001) In 1998, rights to the airline's name were purchased by William E. Stricker of Columbia, Missouri. The reformed Ozark Air Lines received its operating certificate on , and began service 10 days later, from Columbia Regional Airport to Dallas/Fort Worth International Airport and Chicago Midway Airport, using two Fairchild Dornier 328JET aircraft. Later in