UFO experts at the Mutual UFO Network (MUFON) are pouring over the snaps said to have been taken on August 13 and just sent in by an eyewitness.
Scott C Waring, editor of UFO Sightings Daily, is convinced it is the real deal.
He said: “This UFO was seen on an island between England and Ireland.
“The UFO was recorded with an HD camera.
“The silvery colour shows us it is a metallic disk and it looks like it was hiding in the clouds, but caught sight of the passenger jet in the distance and was on its way there to scan them and the technology.”
In a report to MUFON, which is the world’s biggest UFO investigation organisation based in the USA, the unnamed photographer said it was different to birds and aeroplanes in their field of vision, and therefore must be a UFO.
The snapper added: “When taking pictures of the halo around the sun from the coast towards the sea, I glimpsed on the left a falling object like a leaf above the sea.
“Then the object was stabilised and left southbound at an extreme speed.”
The eyewitness was able to take the shot before the object entered the clouds and left to the south.
UFO experts claim the apparent reflection on the object shows it was metallic and not a bird.
The witness added: “A new UFO sighting for me and I am very happy to see a photo that proves this is what I saw.”
Sceptics say that insects or birds caught in flight on camera can often come out blurred, giving the impression they are something larger and further away, and can even give the appearance of a disc-like shape.