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- Source is exactly "The William E. Boeing Sr. Papers (2005-10-06-B), Box 3, Folder 75"
[First flight air mail cover addressed to William E. Boeing, Chicago, Illinois, July 1, 1927]
![[First flight air mail cover addressed to William E. Boeing, Chicago, Illinois, July 1, 1927]](https://digitalcollections.museumofflight.org/files/square_thumbnails/f509d6b0dee352105f08c4eaa155a77e.jpg "[First flight air mail cover addressed to William E. Boeing, Chicago, Illinois, July 1, 1927]")
First flight air mail cover addressed to William E. Boeing, Chicago, Illinois, July 1, 1927. Signed by pilot Hugh Barker.Stamped: "First Flight Under Contract Chicago - San Francisco - Transcontinental Air Mail Route. Salt Lake City, Utah."