> It’s actually the airlines dragging their feet on a lot of this, not “30 year old ATC.” Many airlines don’t upgrade their planes to have the latest equipment.
Yes, and I believe they do not upgrade because it makes no business sense for them. Regulators say, for example, "install ADS-B so you are compliant with latest standards" which at the moment has no tangible benefits for the airline. If, by installing it airline would get useful additional capabilities, such as being able to fly direct from point A to point B or allow for lower separation I suspect they would upgrade quickly.
The above is not (really) bashing ATC -- there is a very low tolerance for mid-air collisions, so regulatory change is very, very slow.
