pull down to refresh
Looks like it's over whatever it is: https://www.fly.faa.gov/adv/adv_list?whichAdvisories=ATCSCC&advisoryCategory=All&date=2026-11-13&airflow=true&_airflow=on&ctop=true&_ctop=on&gStop=true&_gStop=on&gDelay=true&_gDelay=on&route=true&_route=on&other=true&_other=on
That list shows a national ground stop, but when you click it says "no advisory": https://www.fly.faa.gov/adv/adv_otherdis?adv_date=11132026&advn=111
Edit: refreshing my browser shows it. buggy faa website
looks like it came from 1998
Probably off by a a little under a decade; it has this line in the html:
<!--[if IE 7]>
<link href="/faaTemplatePublic/styles/ie7.css" rel="stylesheet" type="text/css" media="screen,projection">
<![endif]-->IE 7 was released in 2006 and the only mentions it has is <IE6, IE6, IE7, nothing else.
A "frequency" issue is weird. Sounds like a botched systemwide DSP update... maybe??
My friends who works in audio engineering --- not quite the same as radar, but still a lot of DSP --- said the DSP algorithms are mostly AI generated now... whereas they used to be handcrafted by engineers
source
Something to do with frequencies?