Static black cylinder seen by an air traffic controller in Athis-Mons

Summary

At 12:45 PM on September 14, 1980, an on-duty air traffic controller in Athis-Mons spotted a black cylindrical object hovering about 300 meters above his position. The object suddenly accelerated and disappeared eastward. The witness's professional background lends credibility to the account, but no additional data were obtained for further analysis. The case remains limited by the brevity of the sighting and the lack of supporting information.