The man was returning from a holiday in Greece when he spotted a series of strange lights hovering in a flying saucer-shaped formation next to his plane.
He spent several minutes filming the lights in the pitch black night sky, between 20 and 30 minutes before the plane landed in Cardiff, reports WalesOnline.
While the man is unable to conclude what it was he saw and filmed, he said
"I thought it maybe could have been lanterns, but they didn't go away, they kept flying until I couldn't see them anymore, it was just a really bright light."
Another possibility is military flares. A couple of miles west of Cardiff Airport is the St. Athan Royal Air Force base. During night time operations flares can be dropped from planes that are working in a covert mode with their visible lights off
Meanwhile, the lights remain a mystery.
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