Air Intelligence Information Reports: Unidentified Aerial Object Sightings, Japan, April 1950

This collection of documents details two separate aerial sightings reported by a pilot of the 9th Fighter Bomber Squadron in Japan on April 27 and 28, 1950. In the first incident, the pilot, flying an F-80C aircraft near Misawa Air Base at 25,000 feet, observed a rectangular, cream-colored object approximately 20 feet high and 60 feet long. The object appeared to track his element leader's aircraft, moving from a position below and behind to a level position before accelerating to an estimated 600 mph and breaking away. The pilot reported no exhaust, propulsion, or control surfaces. A second sighting occurred the following day near Wakkanai, where the same pilot observed a square-shaped, white object at 10,000 feet. This object was estimated to be 12 feet by 12 feet and was observed for two brief intervals before disappearing into clouds. In both cases, the pilot was considered a reliable and conservative observer. Intelligence assessments conducted by the Fifth Air Force concluded that the objects were not physical aircraft or aerodynamic devices. Instead, investigators suggested the sightings were visual effects caused by shock waves from other F-80C aircraft operating in the vicinity. They hypothesized that light refraction in varying air densities, or ice crystals formed by shock waves, created the appearance of the objects. The report notes that the pilot's use of polaroid material might have contributed to the perceived color and form. The document also includes a brief press clipping from Sydney, Australia, dated May 1950, reporting similar sightings of a 'cigar shaped object' by airline pilots, which the Royal Australian Air Force could not explain.