FAA ground stop explained: the three times America halted takeoffs

The FAA’s November 13, 2026 nationwide ground stop was the third such halt in U.S. history. It ran from 3:54 p.m. to 8:15 p.m. Eastern, four hours and 21 minutes. The other two came after the September 11 attacks and the January 2023 safety-notice system failure.

A ground stop holds departures. It does not mean aircraft already in the air freeze in place: controllers continue managing those flights and their landings. Transportation Secretary Sean Duffy said about 3,500 aircraft were airborne when Friday’s halt began, and all landed.

Source: 9/11 Commission Report, chapter 1 ↗

On September 11, 2001, Ben Sliney was on his first day as the FAA’s National Operations Manager. A nationwide departure stop was followed by an instruction to land aircraft already flying. The 9/11 Commission records about 4,500 commercial and general aviation aircraft landing without incident.

On January 11, 2023, the failure was inside the Notice to Air Missions system, or NOTAM: the safety notices pilots review before takeoff. The FAA later said contract personnel unintentionally deleted files while correcting synchronization between the live primary database and a backup. Departures paused for about 90 minutes.

In the November 2026 outage, Duffy described switches and routers overloaded with data, making radar and communications unreliable. Routers pass information between parts of a network. A connection can exist physically while the equipment managing its traffic becomes unable to carry reliable information.

At Saturday’s briefing, Duffy said a contractor had been switching a telecommunications line from copper to fiber and replacing a router at a remote FAA location when the failure began. He named L3Harris; NPR reported that the company had not immediately responded to its request for comment. Officials were still determining whether installation error or faulty equipment caused the router to flood other routers.

The wider modernization is only partly complete. GAO’s September 14 report states that, as of May 2026, the FAA had replaced 2,560 of 5,170 old copper wires with high-speed fiber. The report describes copper dating from the 1960s and finds that the modernization effort lacks an integrated master schedule.

Source: 9/11 Commission Report, chapter 1 ↗

The contractor-and-router account is preliminary, rather than a completed investigation. FAA Administrator Bryan Bedford said officials had no evidence of anything nefarious or an AI-related issue. The sequence identifies where investigators are looking; it does not yet settle which installation action or equipment defect initiated the failure.

Our earlier Miami-sky coverage remains part of this article’s reporting history. SpaceX’s launch-day statements and NASA’s explanation of illuminated rocket exhaust provide context for those sightings. The reviewed sources do not establish a link between the visible sky objects and the FAA network outage.

Watch for the FAA’s technical findings: the initiating router fault, how excessive traffic spread and what prevented isolation. Those details will show which safeguards need to change during the remaining upgrades.

For a traveler, a lifted nationwide ground stop is different from an airline’s full recovery. Aircraft and crews can still be out of position. Check the operating airline’s current flight status for a specific journey.