Felicity Simper.
After more than four decades in the cockpit, retired pilot Chris Crowther has seen just about everything there is to see in the sky.
During his 42-year career, he logged 22,000 flight hours on various routes around the world, but one incident has occupied his mind for almost half a century.
It happened in 1978. Mr Crowther, who lives near Wrexham in Norfolk, was flying a light aircraft approaching Norwich Airport for landing.
He says that in the blink of an eye something happened to them that he still cannot explain.
Decades later, the memory is still fresh in his mind, raising a question that continues to intrigue aviation experts and the general public alike: What are we really seeing in the sky?
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📸BBC/Alex Dunlop/GettyImages/John Fairhall/SEPI Agency/Bill Robinson/Chris Crowther/LightRocket דרך Getty Images.