No.

"January 11, 2023. All U.S. departing flights were halted for several hours after a computer outage crashed the FAA's Notice to Air Missions (NOTAM) pilot notification system"

9/11, 2023 and today are the only three times.

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luxuryballs 3 hours ago | parent [-]

July 19th 2024 crowdstrike/microsoft update issue halted a bunch of (all?) flights in the US also (coincidentally 6 days after presidential assassination attempt)

	▲	echoangle 3 hours ago \| parent [-]
		Not due to a requirement by the FAA but by the airlines being dependent on their windows computers, right? Legally, you were still allowed to fly, I think.