Aviation encounter — near Heathrow airport — 1978-11-23

An airliner crew (perhaps on ground) reported an aerial observation near Heathrow airport on 23 November 1978. A silver triangular object reportedly kept pace with an airliner. The source qualifies that the crew may have been on the ground. Source: Dominique F. Weinstein, Unidentified Aerial Phenomena: Eighty Years of Pilot Sightings (NARCAP TR-04, February2001), PDF page49, table row2.