I've done route planning for satellite internet for domestic flights. airplanes tend to take the exact same paths over heavily concentrated areas, and the hubs

I've done route planning for satellite internet for domestic flights. airplanes tend to take the exact same paths over heavily concentrated areas, and the hubs have a tremendous amount of demand around them. you can verify this by paying for flightaware data and looking at historical data by airline. even without ground traffic consider 3 planes in the same beam need to serve ~500 people. airlines bank on you not using it or charging a lot to keep the numbers down. JetBlue does it for free by subsidizing through the ticket price since people pay a premium for the name.