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unidentified air phenomena by civilian and military pilots in France led to the creation of a database of 150 cases of aeronautical UAP beginning in 1951. The classification into the four categories showed that over 10 percent (fifteen) of the aeronautical UAP cases belong to Type D, the ones that can't be explained despite precise witness accounts and good-quality evidence. In about half these cases, environmental effects such as interference with on-board instruments and/or reported by the pilots when UAP were nearby. In January 1994, SEPRA investigated a case that turned out to be the most exceptional pilot case documented in the French skies. On January 28, Captain Jean-Charles Duboc and copilot Valerie Chauffeur were piloting Air France flight 3532, making the Nice-London connection at a speed of 350 knots (approximately 650 kilometers/hour) in the early afternoon. The visibility was excellent when a crew member informed the captain and his copilot about a dark object to the left of the aircraft, which he thought was a weather balloon. It was 13:14 GMT and the sun was at the zenith. At first, Duboc thought it was an aircraft banking at a 45-degree angle, but soon all three agreed that this was not a familiar object. They estimated a distance of twenty-two miles (fifty kilometers) at an altitude of six miles (ten kilometers). At first it looked bell-shaped, and then more like a lens or disc, brown and large, and the witnesses were struck by its changes in shape. After about a minute, it disappeared almost changes in After changes in shape. After about a minute, it disappeared almost instantaneously, as if suddenly becoming invisible, without any escape trajectory. The duration of this sighting w'as approximately a minute. Captain Duboc reported the incident to authorities at the Reims air navigation control center, which had no information about any aircraft in the location. A report was then sent to SEPRA, which classified it as Type C, meaning it was insufficiently documented for identification. However, Reims contacted the Taverny air defense operations center, CODA, and we later learned something important that allowed us to reclassify this event as a clear Type D: CODA recorded a radar track at their control center in Cing- Mars-la-Pile that corresponded in both location and time to the observation eu eat on Yn i Wale Tee atl 1 a4 te c it of the crew of Air France flight 3532. The object disappeared from view of the radar scope and the crew at the same instant. CODA's investigations ruled out the possibility of a weather balloon. Because the precise crossing distance of the two trajectories was known, experts estimated that the UAP 4 mene was about 750 feet long. In studying aviation cases, an important contribution was made by an outstanding independent French investigator, [6] Dominique Weinstein, who has catalogued 1,305 cases of UAP and UFO sightings by pilots—cases for which adequate data is available to categorize the UAP as unknowns— collected from official sources, including material I provided from CNES/SEPRA. The following results are interesting: 606 cases (36.7 percent) are sightings by military pilots and crews; 444 cases (26.9 electromagnetic disturbances of the radio connection with air traffic controllers were CNES/SEPRA.