and Boeing 727-200 jetliners into Fort Smith on routings of Dallas/Ft. Worth-Oklahoma City-Tulsa-Fort Smith-Little Rock-Memphis-Nashville-New York City JFK Airport and Chicago O'Hare Airport-Kansas City-Tulsa-Fort Smith-Shreveport-New Orleans. Both routes were flown with one round trip flight each day. According to the Official Airline Guide (OAG), in early 1976 Braniff was still operating four flights a day into Fort Smith, all with Boeing 727-200 jets, with roundtrip routings of Chicago O'Hare Airport-Kansas City-Tulsa-Fort Smith-Shreveport-New Orleans, and Dallas/Fort Worth-Oklahoma City-Tulsa-Fort Smith-Little Rock-Memphis-Nashville-New York City JFK Airport. All Braniff service to Fort Smith then ended in early 1979 shortly after airline deregulation took effect. Mid-Continent Airlines began service to Fort Smith in 1946, flying a daily round trip routing of Kansas City-Joplin-Tulsa-Muskogee, OK-Fort Smith-Texarkana-Shreveport-New Orleans with Douglas DC-3 aircraft. Mid-Continent was acquired by and merged into Braniff International in 1952. Central Airlines began service to Fort Smith in the mid 1950s with flights on routings of Tulsa-Fort Smith-Hot Springs, AR-Little Rock and Ft. Worth-Dallas-Paris, TX-Fort Smith-Fayetteville, AR-Joplin-Kansas City. Another flight would follow the latter route from Texas but at Fayetteville it would instead proceed on to Ft. Leonard Wood and St. Louis. During the mid 1950s, Central served Fort Smith with Douglas DC-3 aircraft and would later upgrade their service with Convair 240 piston and Convair 600 turboprop aircraft. In 1967 Central Airlines was acquired and merged into the original Frontier Airlines which in turn continued to serve Fort Smith using Convair 580 turboprops in addition to Convair 600 turboprops previously operated by Central with a total of sixteen flights a day operated into the airport with the Convair propjets in the fall of 1967. Frontier soon added Boeing 727-100 jetliners with nonstop service to Dallas Love Field (DAL), Kansas City and St. Louis with daily direct one stop 727 service to Omaha. In the summer of 1968, Frontier was operating six 727 flights every weekday into the airport with two roundtrip flights a day operated on a routing of Dallas Love Field-Fort Smith-St. Louis with a third roundtrip operating a routing of Dallas Love Field-Fort Smith-Kansas City-Omaha in addition to operating twelve flights a day to other destinations with Convair 580 and Convair 600 turboprops for a total of eighteen departures every weekday from the airport at this time. By 1969, Frontier had begun replacing the 727s with Boeing 737-200 jet flights nonstop to Dallas/Ft. Worth (DFW) as well as direct flights to