[dropcap]A[/dropcap]n insight into the famous UFO case: The RB-47 UFO Incident, Duncanville, 1957. This event was ranked as a top by the Best UFO Evidence in the history of UFO Sightings. UFO follows RB-47 Air Force Jet for two hours. Project Blue Book listed the UFO as a passenger jet in the area. The passenger jet in question was 600 miles away.