September 11, 2001 9:42 A.M.

At 9:42 a.m., the Federal Aviation Administration (FAA) grounded all aircraft within the continental U.S., and aircraft already in flight were told to land immediately.[98] All international civilian aircraft were either turned back or redirected to airports in Canada or Mexico, and all international flights were banned from landing on United States territory for three days.[99] – Wikipedia

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