They do and they did? But it's primarily a manual process. There are automated warning systems such as ACAS and separation warnings, but I don't think it would

They do and they did? But it's primarily a manual process. There are automated warning systems such as ACAS and separation warnings, but I don't think it would be possible to program something that could understand what's going on with all the traffic all the time and just generally warn if it's not looking right...