Study: Drones Present Minimal Threat To Aircraft (cio.com)

itwbennett writes: A study from George Mason University, which estimates danger from consumer drones, suggests that rules around private drone use could be relaxed without endangering general aviation. [Researcher] Eli Dourado [coupled] data on bird strikes with aircraft, with an estimate of the number of birds in airspace and the average weight per species of bird, and concluded that "a two-kilogram drone would cause an injury once every 187 million years of continuous operation."
Dourado admits there are some limitations to his estimate. While drones are crafted with plastic and metal, birds are generally softer and more likely to get squished on impact with an aircraft. However, birds are likely to be flying in flocks, where the danger of having several sucked into the engines is greater. US Airways flight 1549 was a prime example of this as the aircraft encountered numerous bird strikes which took out its engines, causing it to land in New York's Hudson River. In addition, the research doesn't include the possibility of someone maliciously trying to hit an aircraft.