The threat of drone collisions near airports isn't just scary -- it can lead to very real injuries, even if there's no accident. Canada's Transportation Safety Board is investigating an incident where a Porter Airlines flight bound for Toronto took evasive maneuvers in an attempt to avoid a reported drone, injuring two crew members. The exact circumstances (including the nature of the injuries) isn't clear, but it took place near Billy Bishop Airport, an island hub right near Toronto's downtown core. It wouldn't have been hard for someone on the mainland to fly a drone into the path of a low-flying aircraft.