> Which means, if every kid has an equal opportunity (in an absolute sense or on average) to develop the requisite skills to be an air traffic controller and if every kid was equally inclined to apply, and the application process were fair, then eventually around 1/8 of air traffic controllers would be black.

It doesn't mean that at all.

Well, depending on what you mean. It could just be that your premise is known to be false.

Only if black candidates meet the criteria equally, are as interested to work as air traffic controllers as anyone else, have equivalent lifestyles and family support to allow them to do the job as effectively as anyone else, etc.

There are enough differences in socialization, current population education levels, current incarceration rates/history in the population, etc. to make that essentially impossible yes?

As to if they are fair or not? Probably not. are you going to fix it, and if so, how?

We can argue about theoretical from birth path differences all we want, but no one on the hiring side has the time to deal with those or to control them - and if looking at things from a coarse population level - it just doesn’t reflect actual reality right now, yes?