"A spokesperson for Humberside Airport and East Midlands Airport said it wasn't one of their passenger planes and believed it was an RAF training exercise.
But Martin Tinworth from the Ministry of Defence, said the plane was that of NATO (North Atlantic Treaty Organisation) which has its headquarters in Brussels.
He told the Leader the aircraft was a NATO Sentry E3, a surveillance plane, which was on a sortie completing a standard UK orbit.
Thanks to the clearest of clear days, people as far south as Peterborough and up to Louth and the Lincolnshire Wolds could see the concentric circles being created by the aircraft which was at 33,000 feet."
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