The FAA paper adds some detail reinforcing the need for standard routes and also making clear that an onboard pilot plays a role certainly at least in the ramp up. Given that this will restrict payload and the standard routes will limit the points that can be connected I am intrigued by the business case and the demand side of the equation. Maybe I am too sceptical but this smacks of accounts I have read about the early days of the railways, eventually a huge success, but only after quite a lot of trial and error and rather a long time.