Flights have resumed across US airspace after a suspension of aircraft departures and arrivals at airports across the country that lasted several hours. However, officials said it would take some time for flight operations to return fully to normal.Top US officials said on Friday (November 13) that the disruption was not caused by a cyberattack or any widespread technical outage involving Microsoft.The information was reported by the Agence France-Presse (AFP).US Transportation Secretary Sean Duffy said the country's airspace had been reopened and efforts were underway to restore normal flight operations. He blamed outdated technology and equipment for the disruption in air travel.Meanwhile, US Secretary of Homeland Security Markwayne Mullin told reporters that there was no evidence of a cyberattack behind the incident. He also ruled out any connection between the disruption and Microsoft's recent technical issues.