Disappearance of Frederick Valentich Air traffic control, 21 October 1978 aged 20

In 1954, a British Overseas Airways Corporation Stratocruiser was flying between New York and London when it encountered a large, shape-changing UFO surrounded by smaller objects off the left wing while over Labrador, Canada.

At a refuelling stop, the crew was questioned by members of the US Air Force, and the encounter became a media sensation.

Captain James R. Howard, a former RAF pilot, claimed that the strange formation of objects had followed his aircraft for 130 kilometres (80 mi). Apparently, the objects were also tracked on radar at the USAF Cartwright Air Station in Labrador.

Howard gave this report to the British magazine Everybody’s Weekly: It wasn’t exactly a flying saucer. What I saw . . . was more of a flying arrow I guess you’d have called it at one stage.

It seemed to keep changing its shape as it flew beside me …much like a jellyfish assumes varying patterns as it swims through the water. Or maybe the apparent changes in shape were due to the different angles we viewed it from as it banked and turned.

Whatever it was—a giant flying wing, jellyfish, or saucer—of these things I’m quite certain: It wasn’t a trick of light or a figment of the imagination. It wasn’t any sort of electrical, magnetic, or natural phenomenon. And it certainly wasn’t a mirage." (UFO Sightings Hotspot)

Documents from the UFO sighting and detailed analysis:
"Study of an Unusual Phenomenon Observed by BOAC Aircrew over Labrador, Newfoundland June 29, 1954" http://www.martinshough.com/aerialphe.