The numbers I saw were about 400 feet. The bigger issue is that they aren't manned and are presumably flying at a greater frequency than conventional planes. My

The numbers I saw were about 400 feet. The bigger issue is that they aren't manned and are presumably flying at a greater frequency than conventional planes. My concern would be that they fail and fly into the side of my house at full speed. I also don't trust Amazon not to be using these drones for surveillance.