A credible threat from Iran? More likely a technical issue.
replyHappened in 2023 https://www.faa.gov/newsroom/faa-notam-statement
Jan 2023 was the most recent nationwide one.
replyhttps://www.cnbc.com/2023/01/11/faa-orders-airlines-to-pause...
previous time it happened right before chinese baloon made the news
replyit may be something similar - remove all random, but controllable sources of radar return for military to start scanning
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replyIt happened on 9/11, didn’t it?
replyyes, 9/11
replyAnd in 2023, which was more similar to this. This is a departure stop, planes in the air are still heading towards their destinations. This is not the same as 9/11 where flights were redirected to their nearest airports for immediate landings.
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