Project 10073 Record Card: Sighting of Unconventional Aircraft, Sioux City, Iowa, 20 Jan 51

This document is a collection of reports and correspondence regarding an unconventional aircraft sighting over Sioux City, Iowa, on January 20, 1951. At approximately 2020 hours, tower controllers at the Sioux City Municipal Airport and the pilot and copilot of a Mid-Continent Airlines flight (Flight 9) observed a large, cigar-shaped object. The object was described as being one and one-half times the size of a B-29, with a long, slender fuselage and straight wings. It displayed no visible rudders, stabilizers, or engine nacelles. The object performed complex maneuvers, including hovering, rapid acceleration, and circling the transport aircraft in a wide arc. Witnesses reported that the object blinked red and orange lights, which appeared to be manually controlled. The weather was clear with bright moonlight, and the witnesses were considered reliable. The report notes that the object's performance and appearance were unlike any conventional aircraft. Despite an initial evaluation suggesting it might be a B-36, the incident remained classified as 'unidentified' in 1951. The documentation includes routing sheets, spot intelligence reports, and newspaper clippings from the Sioux City Journal and the Kansas City Star, which covered the incident. The Air Force requested further information from the 13th District OSI and noted that the responsibilities of the Air Defense Command regarding such sightings needed to be more firmly established.