No - since it was September, there weren’t other campers, and he played music on the cd on his way home. All he noticed was the incredible quietness, but thought it was due to being away from the city, not to airlines being grounded.
How far was it from home? He didn’t stop anyplace for food or bathroom? Wow.
I on th eother hand worked literally next to a major runway, and the eerieness of first plane after plane after plane coming in there for landing, then an hour later total silence, was unforgettable in itself.