Yeah, not really sure how a globally distributed manufacturing operation with a complex supply chain and customers all over the world that need access to data for their operations is supposed to function effectively without it.
(and I say that as someone that used to sell commercial aviation data that came on CDs...)
I don't think this is related to that "critical" stuff.
It seems there is a misunderstanding over the classification of 'critical' stuff.
We may all have a very different definition.
All I know: the second your are connected to internet, you are cooked.