I would like to acknowledge the assistance I received from the following individuals while preparing this article:
Daniel Piazza, curator, National Postal Museum, reviewed and edited versions of the exhibit text and provided me with several pictures used in this exhibit.
The cover image is an official photograph of the airplane used by the Wright Brothers during their successful flight of 1903. This photograph was the source of the design on the 2-cent stamp.
The following references were consulted in preparing this exhibit:
Bert, Adam K. “2c and 5c Aeronautics Conference 1928 First Day Covers." First Days 59 (1965): 8-11.
Burdette, Linda. “The International Civil Aeronautics Conference of 1928.” Virginia Aeronautical Historical Society XXXIV (July-September 2011), 29-30.
Downs, Charles F. "Celebrating the Wright Brother's First Flight: The International Civil Aeronautics Conference of 1928." Prologue (Winter 2003): 12-18.
Heins, Clark. "Artists of the Beautiful: Dominic A. Brosnan." First Days 26 (November-December 1981): 444-445.
International Civil Aeronautical Conference Stamps 1928. (Two folders in the Stamp Design Files, Papers of the Third Assistant Postmaster General, Smithsonian National Postal Museum Library.)
Katz, Jerry. "The Green Cancellation." Accessed 12 December 2012. http://jerryakatz3.wordpress.com/a110/.
Library of Congress, Prints and Photographs Division.
National Archives and Records Administration at College Park, Maryland. Record Group 255, Records of the National Aeronautics and Space Administration. Still Photographs 255-GF, Folder 520.
"The Postal History of ICAO." Accessed 12 December 2012. http://legacy.icao.int/ICAO/en/hist/stamps/1928_the_international_civil_aeronautics_conference.htm.