The 764 reported incidents are reports from aircraft to the air traffic controller that a drone is in their sight. It doesn't necessarily mean there's a risk of collision, but they're close enough that they can see them. Whenever it's close enough to see, that's a significant event.
For example, when aircraft are flying above each other, there has to be a 1,000-foot separation, or three nautical miles horizontally, so you have to be a long way apart. If you can see a drone, that's a significant event. That would be categorized as a near miss with another aircraft.
As an example that I was involved in, I was getting ready to depart out of, I believe, Atlanta. The aircraft in front of me, just as it was climbing out through a couple of hundred feet, reported a drone, and they actually had to turn to avoid it. When we were given takeoff clearance, we were given a turn right away to avoid it. That's the closest I've come to a drone, and I didn't see it.
The incident that was reported over Lake Ontario last week or the week before—again, we don't know what it was—would be the most severe type of case, where pilots have to take drastic action to avoid hitting a drone. We all know what birds can do to aircraft. We are all very familiar with the Hudson River incident. A drone is a lot more dense. If it's ingested into an engine, it's likely to take out the engine. If it hits a control surface, control of the aircraft could be in jeopardy. If it hits the windscreen, it could crack the windscreen. There's a lot of damage these drones can do to aircraft.