New info on the NK hypersonic missile
https://www.thedrive.com/the-war-zone/43859/mysterious-faa-order-to-halt-flights-was-prompted-by-incoming-north-korean-missile-warning
It looks like FAA got their alert from NORAD, issued for the Aleutian islands all the way down to Los Angeles. Minutes later, NORAD also directed FAA to clear airspace around Vandenberg, which does have some GMD interceptor missiles.
Interdasting.