US flights resume after longest nationwide ground stop since 9/11. Here’s what we know

The US Federal Aviation Administration (FAA) lifted a nationwide ground stop on November 13 after a communications outage halted most departures for more than four hours, stranding thousands of passengers across the country. Homeland Security Secretary Markwayne Mullin attributed the outage to technology upgrades that had "overwhelmed" the existing system, while Transportation Secretary Sean Duffy blamed old network equipment, such as 1980s copper lines.

The ground stop began shortly before 4 pm ET and was lifted at 8:15 pm, marking the longest nationwide halt since 9/11. The outage affected radio communications between pilots and controllers, with the network supporting these communications overseen by L3Harris Technologies.

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