Is this an Iron Giant robot walking on clouds?

An extraordinary picture captured by a plane passenger at 30,000ft shows what looks like a huge robot walking along the clouds.

Some internet users have commented that the figure looks like the robot from the animated movie The Iron Giant.

Flyer Nick O'Donoghue, 30, a software support team manager from Ireland, was on board an EasyJet flight from Austria to London Gatwick when he noticed the bizarre figure in the sky and grabbed his camera.

Mr O'Donoghue however, told MailOnline Travel that he believes the figure resembled the Michelin man.

He said: 'I was flying back from a work ski trip in Austria, I was on the window seat with two work colleges beside me. 

'They were talking like crazy and I was gazing out the window, as you do. I could see this figure in the distance in front of us and then as we flew closer this shape appeared.

Is it a robot or shadow?