They've since disclosed that it was a communications system that went down, not the flight management system. It must have been quite the scare for the people working on the flight management system upgrade, to learn that days after roll-out there was an outage.
The outage seems pretty similar to the NOTAM outage that happened a few years ago, which also resulted in a nation-wide grounding.
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The outage seems pretty similar to the NOTAM outage that happened a few years ago, which also resulted in a nation-wide grounding.