An Al Jazeera explainer reports that the FAA lifted the nationwide ground stop it had imposed on the evening of 13 November 2026 because of a telecommunications outage affecting air route traffic control centres, the third such stop since 11 September 2001, which grounded thousands of flights. Officials including Sean Duffy said disruptions would ease slowly, with FlightRadar24 citing more than 4,700 cancellations, analysts warning recovery could take days, and Duffy urging passengers to check with airlines while calling for $50bn in air traffic control upgrades.