I've seen a few of these before and found them very entertaining, but I wonder how they get the appropriate ATC clearances to cross all of the airways that they'd have to cross. Wouldn't a lot of these paths conflict with airspace that other flights want to use? Are they at very unusual elevations when doing this?
Someone at /r/aviation posted a timelapse of the flight. It seems like most of the flight took place between 38,000 and 42,000 feet (passenger flights are typically in the 30s) and did it after midnight in the US which is a quiet period for passenger flights.
