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- Source is exactly "The William E. Boeing Sr. Papers (2005-10-06-B), Box 4, Folder 21"
[First flight air mail cover addressed to Bill Boeing, Jr., Claremont, California, from William E. Boeing, June 20, 1940]
![[First flight air mail cover addressed to Bill Boeing, Jr., Claremont, California, from William E. Boeing, June 20, 1940]](https://digitalcollections.museumofflight.org/files/square_thumbnails/fe0622dd1aa459c3f84525e6f91a322a.jpg "[First flight air mail cover addressed to Bill Boeing, Jr., Claremont, California, from William E. Boeing, June 20, 1940]")
First flight air mail cover addressed to Bill Boeing, Jr., Claremont, California, from William E. Boeing, June 20, 1940.Stamped cachet: "First Flight F.A.M. 20. Seattle, Washington. U.S. Air Mail."