[ortusdux]

If anything, it served as a great test of that system. But from the sounds of it, NORAD declared this a non-issue and yet a portion of the FAA still proceeded with the shut-down. So whether this was a pass or a fail depends on who has the final authority over shutting down airspace.

[Traster]

It's asymmetrical though right, accidentally not shutting down when it's unclear has a small likelihood of a massive loss of life. Accidentally not shutting down results in some eocnomic loss and lots of delays, but in a real way you know there's seriously limited downside. I don't know how the US is doing right now, but in other countries airlines are running way under capacity at the moment anyway, so they can recover from down time much better than usual.