[rogerrogerr]

Because now we’re talking about putting deeply integrated equipment in every plane. It’s a certification and cost nightmare.

This is not a system where you get to do clean slate greenfield development. Whatever you do must work for the lowest common denominator. ATC is a fairly cheap societal expense compared to developing, certifying, installing, and maintaining systems with the level of integration you want in hundreds of thousands of diverse planes.

[terminalshort]

There are only 35,000 commercial planes on Earth. Even if installing costs $1 million per plane, that's only $35 billion.

[rogerrogerr]

The US has about 200,000 general aviation planes. You can’t ignore them, and you can’t just ban GA because that’s your pipeline for getting commercial pilots.