It works extraordinarily well with 15 times the volume of air traffic than we currently have.
I wish you guys would sprouting deceiving statistics. They may have 15 times the traffic, but it is spread over the whole of the USA. Look at the accident locations.
We may have 15 times less traffic but 90% of our landmass doesn't have a person living in it, let alone and aeroplane flying over it.
Stick to the relevant facts please.