I don't see any convincing rebuttal. Why are airline systems not a juicy target? Why would a successful attack on the system not cause gigantic disruption? Why

I don't see any convincing rebuttal. Why are airline systems not a juicy target? Why would a successful attack on the system not cause gigantic disruption? Why have these long-running, stable systems only recently begun failing so severely? Yes, one is wise to attribute to incompetence over malice, but these systems are demonstrably not run by incompetents: they've been in operation for decades.