U.S. Transportation Secretary Sean Duffy said nationwide flight groundings stemmed from a "telecom failure" tied to aging network systems and asked Congress for $50 billion in emergency funding to upgrade the air traffic control (ATC) system. Duffy said there was no wholesale communications or radar outage during the ground-stop. Department of Homeland Security Secretary Marlin said the incident was not related to Microsoft's recent service outage and that investigators have found no evidence of

U.S. Transportation Secretary Sean Duffy said nationwide flight groundings stemmed from a "telecom failure" tied to aging network systems and asked Congress for $50 billion in emergency funding to upgrade the air traffic control (ATC) system. Duffy said there was no wholesale communications or radar outage during the ground-stop. Department of Homeland Security Secretary Marlin said the incident was not related to Microsoft's recent service outage and that investigators have found no evidence of a cyberattack or AI interference, warning that system age and data overload represent a national security risk; remediation and investigations are ongoing.