V-formations of bluish-green lights observed by Texas Tech professors and photographed by a student became a classic unsolved Project Blue Book case.
A disc-shaped object repeatedly appeared over a searchlight in Norwood, Ohio, tracked by Army instruments and witnessed by hundreds over several months.
Two Eastern Airlines pilots observed a cigar-shaped craft with glowing windows pass their DC-3 at close range, prompting Project Sign's ET conclusion.
The US military initially announced recovery of a 'flying disc' near Roswell, NM before retracting the statement, creating the most famous UFO controversy in history.
Just ten days after Kenneth Arnold's sighting, airline pilots on United Flight 105 observed multiple disc-shaped objects over Idaho, marking the first professional pilot UFO report of the modern era.
Private pilot Kenneth Arnold's sighting of nine unusual objects near Mount Rainier launched the modern UFO era and coined the term 'flying saucers.'