Most airports in the middle of nowhere aren’t controlled.
There are something like 530 ATC towers in the USA out of 5000 or so public airports. 20,000 if we include anything that can be described as an airstrip.
Your wider point still stands though, probably something like 20% of the airports handle 80% of the traffic.
There are something like 530 ATC towers in the USA out of 5000 or so public airports. 20,000 if we include anything that can be described as an airstrip.
Your wider point still stands though, probably something like 20% of the airports handle 80% of the traffic.