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Mail pouch from first airmail flight over the North Pole
https://www.rawpixel.com/image/9066638/photo-image-vintage-plane-public-domain
Free Image from public domain license
de Havilland DH.83 Fox Moth
https://www.rawpixel.com/image/4024131/havilland-dh83-fox-moth
Free Image from public domain license
Fresh Air at Rockaway.
https://www.rawpixel.com/image/14304110/fresh-air-rockaway
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Washington, D.C. Sorting air mail at the main post office. Sourced from the Library of Congress.
https://www.rawpixel.com/image/12267831/photo-image-paper-person-book
Free Image from public domain license