U.S. Congress. Joint Committee to Investigate Dirigible Disasters, ca. 1933. Original public domain image from Flickr https://www.rawpixel.com/image/8799428/photo-image-vintage-public-domain-travelFree Image from public domain licenseRussian Search and Rescue helicopter that was grounded by low visibility at the Arkalyk Airport in Kazakhstan. Original from… https://www.rawpixel.com/image/418584/free-photo-image-rotor-engine-helicopter-pilot-nasaFree Image from public domain licenseAn airliner hostess. Washington, D.C. municipal airport. Sourced from the Library of Congress. https://www.rawpixel.com/image/12239956/photo-image-face-person-public-domainFree Image from public domain license