BREAKING: In an extraordinary move made only one other time since 9/11, the FAA orders ALL flights nationwide grounded, bringing departures across the U.S. to a halt.
The Federal Aviation Administration is directing all departing aircraft to remain on the ground until further notice, citing safety concerns.
International flights arriving in the U.S. will be handled on a case-by-case basis as questions mount over what triggered the sweeping order.
The FAA has not publicly detailed the cause of the emergency action.
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