Plane phone usage
A mate of mine is IFE manager for a medium sized airline. A couple of decades ago he explained to me the reasoning behind the costs of in-flight phone services. They charged passengers $10 per minute but the service cost about $12 per minute from the supplier. It was a loss leader service for the airline.
He once showed me a chart of call durations. There was a peak between 57s and 1m 03s (half the people didn't hang up quickly enough to limit the call to $10). There was another peak around 20-25m. Apart from those peaks usage was pretty flat and around zero. His analysis was that the first peak was caused by idiots who just wanted to show off to their friends and the second was made up of business people for who a $250 phone call was peanuts if it concluded a profitable deal.