The Federal Aviation Administration (FAA) has extended a rare nationwide ground stop until 11:30 p.m. ET as the agency seeks to resolve a “temporary telecommunications outage” which is affecting regional air traffic control centers.

Flights will be held at their origin, while flights en route will be allowed to land as the agency seeks a resolution. Earlier, the agency cited “extraordinary circumstances” and safety for the halt, which is creeping into its third hour.

The ground stop is the third-ever issued by the agency, the other two being in Jan. 2023 and on Sept. 11, 2001. These halts are extremely rare and likely a product of an issue afflicting national communications.

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