Airline Expansion and Innovation(1927 - 1941)

Air Mail Pilot's Knee Board and Map

Joseph L. Mortensen navigated the air mail tour from Salt Lake City, Utah, to Reno, Nevada, in 1920 using this scrolling map and knee board.
Gift of Joseph L. Mortensen

Image number 2007-13837
Credit: Smithsonian Institution, National Air and Space Museum

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