Returning from a U-Boat scouting party. Aerial naval observer coming down from a "Blimp" type balloon after a scouting tour… https://www.rawpixel.com/image/8799373/photo-image-vintage-balloon-public-domainFree Image from public domain licenseLieutenant Earl Carroll, prominent composer, is now a full-fledged aviator in the U.S. Service. He is shown beside his fast… https://www.rawpixel.com/image/8769906/photo-image-face-vintage-airplaneFree Image from public domain licenseMaurice Bourguignon. "Le Dernier raid des zeppelins, 29 au 30 janvier 1916". Paris, musée Carnavalet. https://www.rawpixel.com/image/7726062/image-art-sky-public-domainFree Image from public domain licenseSpark plug wire support loop (forward, proper left side),Motorcycle, Curtiss V-8 https://www.rawpixel.com/image/8846868/photo-image-art-vintage-public-domainFree Image from public domain licenseManufacturing airplanes for the government by Dayton-Wright Airplane Company. Completed plane on exhibition. Plant-1.… https://www.rawpixel.com/image/8802618/photo-image-person-airplane-vintageFree Image from public domain license