Mt. Rainier: Nine disk-shaped objects sighted by pilot
Private pilot Kenneth Arnold observed nine unusual aerial objects near Mount Rainier while searching for a missing aircraft. The sighting triggered widespread media coverage and initiated the modern UFO era in the United States.
Background
On June 24, 1947, businessman and aviator Kenneth Arnold reported observing nine unusual objects flying in formation near Mount Rainier, Washington. He estimated their speed at over 1,000 miles per hour, describing their motion as similar to saucers skipping across water. This observation became the first widely publicized "flying saucer" report in the United States. The incident triggered a massive wave of similar sightings across the country and established the foundation for modern UFO investigation and public interest in unidentified aerial phenomena.