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- Source is exactly "The William E. Boeing Sr. Papers (2005-10-06-B), Box 4, Folder 5"
[First flight air mail cover addressed to Bill Boeing, Jr., Honolulu, Hawaii, May 28, 1937]
![[First flight air mail cover addressed to Bill Boeing, Jr., Honolulu, Hawaii, May 28, 1937]](https://digitalcollections.museumofflight.org/files/square_thumbnails/4669762814d87cc31184dbe296421b92.jpg "[First flight air mail cover addressed to Bill Boeing, Jr., Honolulu, Hawaii, May 28, 1937]")
First flight air mail cover addressed to Bill Boeing, Jr., Honolulu, Hawaii, May 28, 1937.Stamped cachet: "Primeiro Voo – Correio - Transpacific - Macau-USA."