'The crew is said to have remained “in constant visual contact” with the drones to avoid collision'
'Half an hour later, a Boeing B777 reported seeing “a large white drone, about two metres across and with four prongs” flying about 50 metres from the aircraft. It was believed to be one of the drones spotted earlier.'
How fast were these drones flying or how slow was the plane flying to remain in constant visual contact.
They were so big arsed drones at over 6 feet across, probably nearly 8 feet if you count the size of props needed to keep it in the air.
They should have no problem finding the guilty drone pilots, they will be the ones loading their 8 foot drones back into their large lorry ;-)