How dangerous are drones to aircraft?
The UK regulations surrounding drones and what can be done to stop them flying over airports
A mid-air collision with any object is dangerous to aircraft, as exemplified by the crash of US Airways Flight 1549 in January 2009, when Capt Chesley Sullenberger steered a passenger jet carrying 155 people into the Hudson River after it hit a flock of Canada geese shortly after taking off from La Guardia airport. The birds destroyed both aircraft engines and their impact can be compared to that of a drone. A Canada goose weighs between 2kg and 6.5kg – a similar weight to many professional quality camera drones. . They could, on that basis, pose a serious threat to a plane.
Source: Guardian Transport