The US has lifted its nationwide flight suspension after a technical failure disrupted air traffic control for over four hours, marking the longest ground stop since 9/11 and renewing calls to modernise ageing systems. Al Jazeera’s Richard Gaisford reports. Subscribe to our channel Follow us on X: Find us on Facebook Check our website: Download AJE Mobile App : #US #USFlights #FAA #AirTrafficControl #FlightSuspension #FlightDisruption #TechnicalFailure #Aviation #AirTravel #FlightSafety #9/11 #AlJazeeraEnglish.