From the records of the Air Forces "Project BLUE BOOK," this message dated December 3, 1957, references the sighting of an “unidentified aircraft” by the pilot of an Air Force F-86 in the skies over Joliet, Illinois on November 27. From 1947 to 1969, a total of 12, 618 sightings were reported to Project BLUE BOOK. Of these 701 remain "Unidentified."
More about the records of Project BLUE BOOK…