Initially Mistaken for a Drone, Object Eludes Investigators
The pilot spotted a bright, metallic object at an altitude of about 1,770 meters (5,800 feet) shortly after takeoff from Heathrow, in broad daylight.

A British Airways flight from Heathrow to New York, carrying 256 people, narrowly avoided an object at an altitude of about 1,770 meters (5,800 feet) over England on June 24. The official committee classified the incident as a serious safety concern but could not determine what the object was.
Questions & answers
What is known about the object that passed near the plane?
The crew described it as a bright, metallic object about the size of four toasters. The committee could not identify it, and the only explanation mentioned, a drone, was not confirmed.
Was there a collision with the plane?
No. The report said the object passed very close to the wing, but the plane continued its flight and landed in New York with no injuries.