June 24, 1947: The Kenneth Arnold UFO SightingOn this day in 1947, civilian pilot Kenneth Arnold reported seeing nine unidentified objects flying at supersonic speed past Mount Rainier. Newspaper accounts referred to what he saw as "flying saucers," which popularized this term. There's no indication that Arnold was lying about what he saw. Skeptics suggest that he might actually have been seeing birds or some kind of mirage. So his report itself isn't a hoax. But his report is widely credited with ushering in the modern era of UFO sightings, which has been a rich source of hoaxes. [
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However, it should also be noted luminous disk and cigar shaped objects in the sky have been reported since long before Arnold's sighting. Charles Fort records several from the 19th century.