FAA issues nationwide ground stop due to "extraordinary circumstances"

Does anyone have any insight on this? Currently at LGA and they’re continuing boarding procedures, but they’re not giving us any updates otherwise.

Is this the first such case since 9/11?

Could this be related to what caused Outlook to go down?

First, the Microsoft outage. Now this.

Extraordinary.

Some more discussion on source: https://news.ycombinator.com/item?id=50489641

Related:

https://news.ycombinator.com/item?id=50489641

Something with frequency of ATC signals?

earlier discussion: https://news.ycombinator.com/item?id=50489641

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