English: 109th Observation Squadron. Approved 7 March 1939. Reinstated for 109th Air Transport Squadron 15 December 1965.
Date
Source
Maurer, Maurer , ed. (1982) [1969] Combat Squadrons of the Air Force, World War II (reprint ed.), Washington, D.C.: Office of Air Force History, p. 338 Retrieved on December 17, 2016. ISBN: 0-405-12194-6. OCLC: 72556. and Hubbard, Gerard (June 1943). "Aircraft Insignia, Spirit of Youth". Vol. LXXXIII (No. 6) National Geographic, pp. 710-722 modified with Microsoft Paint
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