10:39 a.m. September 11, 2001: FAA Closes All US Airports
The FAA’s Command Center in Herndon, Virginia, issues a formal Notice to Airmen (NOTAM), closing all operations at all US airports. [US Congress. House. Committee On Transportation And Infrastructure, 9/21/2001; Federal Aviation Administration, 3/21/2002
; Harrald et al., 7/15/2002
]