Drones that collide with planes cause more damage than birds of the same size because of their solid motors, batteries and other parts, a study released by the Federal Aviation Administration on Tuesday found.
The study's researchers say aircraft-manufacturing standards designed for bird strikes aren't appropriate for ensuring planes can withstand collisions with drones. The FAA said it will depend on drone makers to help develop technology to detect and avoid planes.
Reports of close calls between drones and airliners have surged. The FAA gets more than 250 sightings a month of drones posing potential risks to planes, such as operating too close to airports.