References Ozark Air Lines “Airline timetables: Twin Otters,” http://airlinetimetableblog.blogspot.com/2010/11/ ozark-air-lines-twin-otters.html accessed on May 24, 2012. Lynch, Christoper. Chicago: Lake Claremont Chicago's Midway Airport: The First Seventy-five Years. Press, 2012. various issues, 1940 2012. Official Airline Guides, – Schwieterman, Joseph and Alan Mammoser. Beyond Burnham: An Illustrated History of Planning for Lake Forest, Illinois: Lake Forest College Press, 2009. the Chicago Region. Young, David, DeKalb: Northern Illinois University Press, Chicago Aviation: An Illustrated History. 2003.
References “Airline timetables: Ozark Air Lines Twin Otters,” http://airlinetimetableblog.blogspot.com/2010/11/ ozark-air-lines-twin-otters.html accessed on May 24, 2012. Lynch, Christoper. Chicago's Midway Airport: The First Seventy-five Years. Chicago: Lake Claremont Press, 2012. Official Airline Guides, various issues, 1940 – 2012. Schwieterman, Joseph and Alan Mammoser. Beyond Burnham: An Illustrated History of Planning for the Chicago Region. Lake Forest, Illinois: Lake Forest College Press, 2009. Young, David, Chicago Aviation: An Illustrated History. DeKalb: Northern Illinois University Press, 2003.
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