Aviation encounter — East of Pittsburgh, Pennsylvania — 1991-09-08

B727 crew and one astronomer reported an aerial observation East of Pittsburgh, Pennsylvania on 8 September 1991. The observation involved a formation of three saucers flying at very high speed. Source: Dominique F. Weinstein, Unidentified Aerial Phenomena: Eighty Years of Pilot Sightings (NARCAP TR-04, February2001), PDF page54, table row7.