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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 Airplane, the Douglas B-19, Super-Bomber for United States Army Air Corps. Clover Field, Santa Monica, California to March Field, Riverside,…
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 - New York - Boston - U.S. Air Mail."
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 the Martin Co. for the U.S. Navy - World's Largest Flying Ship."
Air mail postcard addressed to William E. Boeing, Seattle, Washington, from the Des Moines Post Office, Iowa, August 10, 1928. Text reads: "Congratulations - Des Moines, IA today dispatched more than 40,000 pieces of air mail via Boeing planes for a new worlds record. From the Postmaster Supervisors and Postal Employees of the Des Moines Iowa Post Office."