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- Source is exactly "The William E. Boeing Sr. Papers (2005-10-06-B), Box 4, Folder 25"
[Demonstration flight air mail cover addressed to William E. Boeing from Douglas Aircraft Company, October 1, 1946]
![[Demonstration flight air mail cover addressed to William E. Boeing from Douglas Aircraft Company, October 1, 1946]](https://digitalcollections.museumofflight.org/files/square_thumbnails/56e596894d38e2c0dc74fc0e71febf37.jpg "[Demonstration flight air mail cover addressed to William E. Boeing from Douglas Aircraft Company, October 1, 1946]")
Demonstration flight air mail cover addressed to William E. Boeing, Seattle, Washington, from the Douglas Aircraft Company, Santa Monica, California, October 1, 1946.Stamped cachet: "Demonstration flight - Flying Post Office - En route - Los Angeles…