Aviation encounter — over Hertfordshire, London area — 1997-06-07

One Aer Lingus jet (flight BAe-146) two pilots reported an aerial observation over Hertfordshire, London area on 7 June 1997. The pilots reported a near collision with a red, blue and white object that passed close to the aircraft. Source: Dominique F. Weinstein, Unidentified Aerial Phenomena: Eighty Years of Pilot Sightings (NARCAP TR-04, February2001), PDF page55, table row21.