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."
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…
Letter and first flight air mail cover addressed to William E. Boeing and Bertha Boeing from Gordon D. Brown, Douglas Aircraft Company, June 27, 1941. Sends cover to celebrate aviation progress.Stamped cachet: "B-19, Initial Flight of World's Largest…
First flight air mail cover addressed to William E. Boeing, Seattle, Washington, from the Glenn L. Martin Company, Baltimore, Maryland, July 3, 1942.Stamped cachet: "First Flight - This cover carried on first official flight of the 'Mars,' built by…
First flight air mail cover addressed to William E. Boeing, Seattle, Washington, December 5, 1946.Stamped: "U.S. Air Mail, First Flight AM-77, Olympia, Washington."
First flight air mail cover addressed to Bill Boeing, Jr., Seattle, Washington, June 21, 1947.Stamped cachet: "First Flight A.M. 3 from Bozeman, Montana - Northwest Orient Airlines."Stamped cachet: "U.S. Air Mail, First Flight, Bozeman, Mont."Stamped…