Dan Hagedorn, Sr., is Curator and Director of Collections at The Museum of Flight at historic Boeing Field in Seattle, Washington. He was previously Adjunct Curator and Research Team Leader at the National Air and Space Museum, Smithsonian Institution, Washington, DC, for 19 years. Prior to that, he served in the U.S. Armed Forces for 27 years in leadership and intelligence positions worldwide and has, to date, authored 21 monographs or books detailing various aspects of aviation and aerospace history. In conjunction with the 150th Anniversary of the Smithsonian Institution, he was named an Unsung Hero of the Smithsonian Institution and was awarded the Orden Merito Santos-Dumont by the Brazilian Government for services to Latin American aviation history, in which he specializes. Mario Overall - Co-founder of the Latin American Aviation Historical Society, has studies of Systems Engineering at the Mariano Galvez University of Guatemala. He served in the Guatemalan Air Force as Computer Specialists and then in the same capacity with the Narcotics Affairs Section of the U.S. Embassy to Guatemala. Mario has co-authored two books and published more than 15 articles related to Central American aviation history topics in renowned magazines in the U.S., Spain, Brazil, Mexico, England, France and Poland. He also has collaborated with several authors in their research work about Latin American Aviation History.