Couldn’t they track it until it crashed? I know they tracked the golfers plane over several states. It seems this plane was there and then gone in almost an instant?
The golfer’s plane was on radar and flew past where it was supposed to land. A military jet was sent up and the pilot could see people were unconscious. Plus, from what I’ve read the pilots on the big planes have to take over from the auto pilot to make corrections ever now and then. Apparently that isn’t necessary in a Gulfstream.