US flights resume as longest shutdown since 9/11 is blamed on ‘old hardware’; one Dublin flight cancelled as disruption could last days

Flights across the United States were grounded for about four hours ‘due to extraordinary circumstances’, causing thousands of cancellations and delays. - Authorities say overloaded ‘old hardware’ in air traffic control systems caused the outage, not a cyberattack. - First flights from the US to Dublin Airport are due to land shortly