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18 March 1991 -
Yushan, China -
Airliner encounters ring-shaped object, two rectangles.
26 March 1991 11:20 -
Aberdeen, Dyce Apt, UK -
Helicopter Pilot incident.
21 April 1991 -
London, UK -
Missile crossed path of MD-80, radar and visual tracking.
21 April 1991 21:00 -
Kent, UK -
Alitalia incident. Explanation: Meteor.
21 April 1991 Night -
Heathrow Apt, UK -
An object was tracked by radar and sighted visually. One object was observed at an airport. Explanation: Meteor.
8 June 1991 18:00 -
Concepcion, Paraguay -
Lap Airline incident.
28 December 1991 -
Toronto, Ontario, Canada -
Rated as high-reliability unknown.
28 December 1991 00:40 -
London, Ontario, Canada -
Radar visual confirmation. Eschelon formation, airplane radar contact.
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