Something that has managed to ground a lot of planes and disable emergency calls today is in fact critical. The outcome of it failing proves it is critical. Whatever it is.
Now, that it was not known previously to be critical, that may be. Whether we should have realised its criticality or not, is debatable. But going forward we should learn something from this. So maybe think more about cascading failures and classify more things as critical.
I have to wonder how the failure of billing and baggage handling has resulted in 911 being inoperative. I think maybe there's more to it than you mention here.
Now, that it was not known previously to be critical, that may be. Whether we should have realised its criticality or not, is debatable. But going forward we should learn something from this. So maybe think more about cascading failures and classify more things as critical.
I have to wonder how the failure of billing and baggage handling has resulted in 911 being inoperative. I think maybe there's more to it than you mention here.