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The bizarre video appears to show a huge grey object tilting above the clouds before straightening out and soaring through the air.

It seems to fly at the same speed and altitude as the passenger plane.

Kerry Forides captured the moment over Turkey on Wednesday afternoon (March 21).

He wrote on YouTube: “It appears to be flying away at right-angles from our commercial jet.

“Somehow without either of us appearing to turn we end up almost following it.

(Image: YOUTUBE/KERRY FORIDES)

“What UFO is this?”

The baffling clip has since been viewed more than 43,000 times since it was shared by renowned alien hunters Blake and Brett Cousins.

“What in the world is that?” one viewer asked. “My mind can't reference anything to that, no comparison.”

Another referenced the US Air Force’s rumoured 4,602mph warplane, adding: “Probably a really fast government jet, because airplanes do not go vertical then to an angle like that.”

“It’s like some part of craft, like a wing of a UFO,” a third commented. “They’re out there.”

Others speculated it could be a chemtrail, following the conspiracy theory that high-flying aircrafts deliberate spray chemicals into the sky for secret reasons.

While one simply suggested there was a military jet on the object’s tip, which had left a contrail.

It comes after a similar video surfaced appearing to show a UFO chasing a passenger jet.