Its astounding that for decades aeroplanes could fly around the globe all reliant on the people/labour behind a desk somewhere with minimal 'system input.' Now it's all computer based, minimal cost, minimal labour. So a 'system outage' cripples even the biggest airlines, its even happened to airservices.
Occurring frequently in the last few years, from the checkin outage, flight planning outages and whatever the airservices acronyms are.