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They're saying it was related to a hardware failure. I have a hard time imagining what kind of hardware failure could result in a nationwide stop though. But I don't know what goes into air traffic control. Perhaps it's a lot more centralized than we know?
Or they could be talking out of their asses.
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I was thinking a solar flare but not much is happening: https://www.spaceweatherlive.com/en/solar-activity/solar-flares.html