Kenneth Arnold

Kenneth Arnold (1915–1984) was an American businessman, private pilot and author whose sighting on 24 June 1947 near Mount Rainier, Washington, ignited the modern UFO era. While searching for a missing Marine Corps C-46 transport plane, he observed from his CallAir A-2 nine shiny, crescent-shaped objects flying in echelon formation at estimated speeds above 1,200 mph — three times faster than any known aircraft of the time. Arnold's comparison of the motion to "a saucer skipping across water" was sharpened by the press into the iconic term "flying saucer".

• American businessman, licensed pilot with extensive flying experience
• Historic sighting on 24 June 1947 near Mount Rainier: nine crescent-shaped objects in echelon formation
• Motion "like a saucer skipping across water" → media coinage of the term "flying saucer"
• Sighting occurred while searching for a missing Marine Corps C-46 transport plane
• Over 800 follow-on sightings nationwide in summer 1947, triggering government and military investigations
• Testified before Project Sign investigators; classified as a "Daylight Disc" in Hynek's taxonomy
• Co-authored The Coming of the Saucers (1950) with Ray Palmer, theories of extraterrestrial origins, later pursued the 1949 Maury Island incident

Arnold's sighting is the archimedean point of civilian UAP research: without it there would be neither the term "flying saucer" nor the wave of state investigative programs that later became Project Sign, Grudge and Blue Book. Precisely because Arnold was a licensed pilot and a credible witness, his observation still stands as a cornerstone of UFO history — despite ongoing skepticism about the exact nature of what he saw.