The pilot, flying from the Canadian city of Montreal to Heathrow, said there was a "very bright light" and the object had come up along the left side of the aircraft before it "rapidly veered to the north".
A pilot, flying a Virgin Airlines plane from Orlando to Manchester described the sight as a “meteor or another object making some kind of re-entry”, adding it seemed to be “multiple objects following the same sort of trajectory – very bright from where we were.”
According to a recording of the conversation by Airlive, a site for enthusiasts, the pilot was told there were no military exercises in the area.
The Irish Aviation Authority is investigating after an unidentified flying object was sighted by pilots flying over Ireland.
On the morning of 9 November the pilot of British Airways flight BA94 from Montreal called air traffic control in Shannon to report seeing an object moving past her aircraft, and asked if there were any military exercises taking place off the west coast of Ireland.
Pilots report seeing UFO in sky off Ireland
What it could be? Pilots said they saw a bright light that disappeared at very high speed
Bright lights moving so fast were seen from the air over Ireland Friday. No one is calling the sight aliens, but authorities are taking a closer look.
"Following reports from a small number of aircraft on Friday 9 November of unusual air activity the IAA has filed a report," the Irish Aviation Authority (IAA) said.
The sighting was recorded over radio traffic between air traffic control in Shannon, Ireland, and multiple pilots.
Irish aviation officials are investigating after two airline pilots reported seeing unidentified flying objects off the southwest coast of Ireland last week, the Irish Examiner reports.
Space junk could explain what pilots saw over Ireland last week.
UFO probe after pilots flying BA and Virgin Airlines jets report seeing mysterious bright lights moving fast as they crossed Ireland
The pilot said her plane and the object were not on a collision course, but she was “wondering” what it could be.
The pilot said he saw "two bright lights" over to the right which climbed away at speed.
Or, as one of the pilots suspected, it could have been a small meteor burning up in the atmosphere.
At that point another pilot cuts in, saying his Virgin Airlines 747 also had encountered multiple meteors or some other sort of objects "making some kind of reentry."
Listen: Pilots report multiple UFO sightings in Irish airspace - investigation underway