Due to "rolling frequency outtage" [sic]: From a claimed photo of FAA documents (I replaced the all caps with lowercase):

"... ground stop is in effect for all destinations until further notice due to rolling frequency outtage in multiple centers..."

and

"... the ground stop is now a nationwide ground stop for all centers, all destinations until further notice due to widespread frequency outtages.. ..."

https://x.com/Anna_Giaritelli/status/2121344915091206311

Which is cited in the Hindustan Times (leading Indian newspaper), which refers to the Twitter source as a journalist.

https://www.hindustantimes.com/world-news/us-news/faa-issues...

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(EDIT: @mods / @dang: Around January this year (iirc) somehow my account ended up rate-limited, posts relatively demoted (start low, drop quickly), vouches/flags relatively ineffective, etc. Usually I don't care too much and haven't bothered to do anything about it but it is sometimes annoying - it limits participation - and right now it buries some of the more valuable information in the discussion. Could you look into fixing it? I don't know of a reason this account would be penalized. Thanks.)

I guess they don't have many outages, otherwise they'd probably know how to spell the word by now...