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- Source is exactly "The William E. Boeing Sr. Papers (2005-10-06-B), Box 4, Folder 22"
[First flight air mail cover addressed to Mrs. William E. Boeing, Seattle, Washington, June 22, 1940]
![[First flight air mail cover addressed to Mrs. William E. Boeing, Seattle, Washington, June 22, 1940]](https://digitalcollections.museumofflight.org/files/square_thumbnails/3604438e927e69dd9610e2e75e749931.jpg "[First flight air mail cover addressed to Mrs. William E. Boeing, Seattle, Washington, June 22, 1940]")
First flight air mail cover addressed to Mrs. William E. Boeing, Seattle, Washington, June 22, 1940. Includes brief note informing Bertha Boeing to keep the cover if interested and return it if not.
Stamped cachet: "Seattle-Juneau, U.S. Air Mail…