An investigation has been launched after several pilots spotted mysterious lights off the south-west coast of Ireland.
The pilot contacted Shannon air traffic control to check if there were military exercises and was told that there were no exercises in the area, the report said.
The British pilot onboard the flight from Montreal to Heathrow revealed that the UFO had come up along the left side of the aircraft before it rapidly moved to the North at a very high acceleration.
Donal said, 'I saw what appeared to be a very bright object in the sky, it wasn't moving like a plane, it was hovering and moving sideways'.
Press reports indicate the bright lights were seen Friday morning by pilots from British Airways and Virgin Atlantic.
The Irish Aviation Authority said, 'Following reports from a small number of aircraft on Friday, November 9, of unusual air activity, the IAA has filed a report.
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One claimed the UFO was travelling at an "astronomical" speed of at least Mach 2 (2,500 km/h), which is twice as fast as a commercial plane.
ATC said there were no military exercises had been planned, before eerily adding: "There is nothing showing on either primary or secondary radar". It begins 17:50 and ends right after the 20:00 minute mark.
The Irish Examiner reports that a pilot of a Virgin Airlines Boeing 747, flying from Orlando to Manchester, then joined the conversation to detail the sighting of an object re-entering the atmosphere.
The reports created quite a stir on social media, with many wondering if it was aliens visiting earth and others putting forward conspiracy theories.
A spokesman for the Irish Aviation Authority confirmed to TIME it was investigating the incident, saying the confidential process would involve talking to all pilots involved.