📍 Case Focus: Mount Rainier, Washington, USA 📅 Date of Incident: June 24, 1947 🔍 Classification: Aerial Sighting / Historical Classic Case

Incident Overview

On the afternoon of June 24, 1947, private pilot Kenneth Arnold was flying his CallAir A-2 aircraft to Yakima, Washington. As he approached Mount Rainier, he suddenly saw a string of shiny objects flying at an incredible speed.

Arnold later described: “They flew like a saucer skipping across water.” This description led a reporter to coin the term “Flying Saucer”, which has since become synonymous with UFOs.

Sighting Details

• Number of objects: 9
• Shape: Flat, circular, with a metallic shimmer
• Flight pattern: Flying in a chain formation, bobbing up and down
• Estimated speed: 1,700 miles per hour (far exceeding any aircraft of the time)
• Duration: Approximately 3 minutes

Subsequent Impact

Arnold’s report triggered the first large-scale UFO sighting wave in U.S. history—over 800 similar reports were filed in 1947 alone. This incident also directly prompted the U.S. Air Force to launch formal investigations, including Project Sign and Project Blue Book.

Historical Significance

This case is regarded as the beginning of the modern UFO era. Arnold, a credible businessman and experienced pilot, had his report widely covered by the media, bringing the UFO phenomenon into the public eye.

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📚 Source: Historical archives, U.S. Air Force documents 🕐 Article creation date: 2022-01-15