Stamped: "First Flight Under Contract - Chicago to San Francisco - Transcontinental Air Mail Route, Omaha, Nebraska."Creation Date1927-07-01SubjectAir mail serviceOriginal Formatenvelopesfirst flight coversBibliographic CitationThe William E. Boeing Sr. Papers/The Museum of FlightRightsIn copyright
[First flight air mail cover addressed to Master Bebo Boeing], [2005-10-06-B_text_194]. Museum of Flight Digital Collections, accessed 19/01/2026, https://digitalcollections.museumofflight.org/nodes/view/8760
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