A passenger on board a Ryanair flight from London to Budapest on January 22 was surprised to see a strange grey object hovering above the clouds.

"I spotted it from Ryanair flight FR8354 from London Stansted to Budapest," said the filmer, Zalan Szabo.

"I don’t have any theories of what it could have been... possibly a UFO," he said.

"It was too big and too high to be a bird and it couldn’t have been an aeroplane because it changed its shape and was hovering," he added.

"It also seemed to change shape and rotate as it seems flat and horizontal on the first picture and like a vertical tube on the last pictures and videos," Szabo said.

"I filmed it at 12.06 pm. Don’t exactly know which country the plane was flying above at the time. I think above Austria," he said.

Strange dark flying object, UFO seen hovering in the sky above Austria during a passenger flight from London to Budapest. Video plus images. Music is copyright-free

I spotted it from Ryanair flight FR8354 from London Stansted to Budapest. I don’t have any theories of what it could have been possibly a UFO as it was too big and too high to be a bird and it couldn’t have been an airplane because it changed it’s shape and was hovering. I have multiple high quality pictures of it. It also seemed to change shape and rotate as it seems flat and horizontal on the first picture and like a vertical tube on the last pictures and videos. I filmed it at 12.06PM. Don’t exactly know which country the plane was flying above at the time. I think above Austria.