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- Source is exactly "The William E. Boeing Sr. Papers (2005-10-06-B), Box 4, Folder 14"
[First flight air mail cover addressed to William E. Boeing, Seattle, Washington, May 19, 1938]
![[First flight air mail cover addressed to William E. Boeing, Seattle, Washington, May 19, 1938]](https://digitalcollections.museumofflight.org/files/square_thumbnails/ce1fef609c9f75b830a40bcda9ca8832.jpg "[First flight air mail cover addressed to William E. Boeing, Seattle, Washington, May 19, 1938]")
First flight air mail cover addressed to William E. Boeing, Seattle, Washington, May 19, 1938. Stamped cachet: "Aviation History, 1911-1938 - Glenn L. Martin Flies First Plane into Clay Center, Nebraska, 1911. 1911 - Pusher type plane. 1938 - Glenn…