🇺🇸 USAF — Project Blue Book
In April 1952, several civilian pilots in Benson, Arizona, observed a bright, oval-shaped object that remained stationary in the sky for over 50 minutes. The object, described as silvery and luminous, showed no relative movement and did not change in size or intensity. One instructor decided to fly to 13,500 feet for a better view, but the object did not appear to move closer or farther away. Eventually, the object vanished suddenly, without a trace. Although explanations such as weather balloons or planets were considered, none were confirmed. The case remains unsolved.