A British Airways plane with 180 passengers on board came a few feet away from colliding with a drone over Kent, according to a report.
The Airbus A321 from Athens, Greece, to London Heathrow was flying at speed of more than 250mph at a height of 9,600ft at the time.
The incident is thought to be one of the closest ever near misses between a BA jet and an illegally-flown drone.
It happened just before 4.30pm on January 3 as the airplane was heading into a holding stack around six miles south of Sevenoaks while waiting its turn to join the final flight path into Heathrow Airport.
The drone was being flown at 24 times the usual maximum legal height for the devices which is just 400ft.
It is believed that the operator of the drone was never found, but they they could have been jailed for up to five years for endangering an aircraft.
According to the report by the UK Airprox Board, pilots described the drone as being around 5ft over their wing and just 30ft from their cockpit.
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