The nine-year-old girl was showing off the view out a window as her dad filmed when the mystery dark object was captured on camera.
David Woodward filmed daughter Georgia on the flight from Manchester to Lanzarote this month.
The video, which has been uploaded to YouTube, shows Georgia talking next to the view when the odd black object appears to zooms past the visible wing.
Mr Woodward told the Manchester Evening News: “We had set off from Manchester and were only in the air for around 10 minutes when we started filming Georgia for her YouTube channel.
“She was saying how lovely the sky was and then I saw the black object.
“It was strange because it kept changing direction and then bobbing and weaving around
“I thought it might have been an anomaly on the screen or a bird. But after looking into it, a bird wouldn’t be that high up.”
Although Mr Woodward thinks the truth might be out there, Georgia is more skeptical.
He added: “Georgia was a bit skeptical and she laughs at me for saying it might be a UFO, but you never know.”
He hopes someone can help identify the object, and is interested in theories.
But, one forensic UFO investigator believes the footage could put a “stain” on real research.
Scott Brando runs the hoax-busting website ufoofinterest.org.
He said he believes the footage shows an optical illusion, after he was sent it by Express.co.uk.
He said it was just a smudge on the window that was out of focus.
Because of the camera shaking, it appeared to have the erratic movement.
At one point in the video, the object, which appeared to be beyond the wing, was suddenly in front of it, adding to his theory.
He tweeted: “The object isn’t a UFO over Manchester but a stain on the window. Its movements are specular with camera shake.”