On Wednesday, October 4, 2017 at 11:05:58 AM UTC-4, wrote:
Perhaps most scary is that 105 Drones encounters were reported since May 2014 with more than half of those (67) in the last 12 months
Average Drone altitude was 4138 ft with one reported as high as FL250

How did a drone get to FL250? I thought they'd run out of battery much lower than that. The hobby type drones, anyway. Do military drones fly that high? Do they use transponders, ADS-B, whatever?

The non-sailplane "gliders" were presumably hang-gliders or para-gliders? Us who fly sailplanes need of course to watch out for those in some of the same areas were we fly, as they seek the same thermals. They are slower moving and easier to see than sailplanes.