Thanks for your replies. I also emailed Flightradar24 directly as I was unsure of which filters to clear. They said to clear the following: Airline, Aircraft, Altitude, Speed, and Airport. All other filters to remain checked. All planes are now displayed correctly. I must somehow have checked all the ones that should remain with an X by them, but can't remember doing so. At my age of 75 I suppose that must have been a 'senior moment'
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