US air traffic resumes after major technical glitch grounds thousands of flights

UPDATE - follow-up to Nationwide FAA ground stop: nearly 11,000 flights delayed or canceled at airports across the US: The Federal Aviation Administration has lifted a nationwide ground stop that delayed or canceled more than 11,000 US flights and caused sudden airport chaos.

Official Response

US transportation secretary Sean Duffy announced that the airspace opened at 8:15 p.m. Eastern Time after officials identified the problem. Duffy stated that the routers got overloaded with data and produced inconsistent information, forcing authorities to shut the system down. Homeland security secretary Markwayne Mullin confirmed that preliminary checks showed no indication of a nefarious attack, pointing instead to a telecommunications outage. Both officials used a White House briefing to urge Congress for a full funding package to build a brand new air traffic control system.

Background

The shutdown lasted more than four hours and required aircraft to stay on the ground while over 3,500 planes remained in the air. This marks only the third time all departing flights have been grounded nationwide in the US, following similar actions on September 11 and in January 2023. International and domestic travel faced widespread ripple effects, with airports issuing warnings for travelers to confirm flight statuses before arriving.

Context

Air traffic control networks rely on a mix of digital tools and legacy hardware that require careful maintenance and significant federal investment to upgrade. Major technical outages of this scale are rare because aviation authorities maintain strict safety protocols to halt departures immediately when system data becomes unreliable.