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 http://bit.ly/AJSubscribe Follow us on X: https://twitter.com/AJEnglish Find us on Facebook https://www.facebook.com/aljazeera Check our website: http://www.aljazeera.com/ Download AJE Mobile App : https://aje.io/AJEMobile #US #USFlights #FAA #AirTrafficControl #FlightSuspension #FlightDisruption #TechnicalFailure #Aviation #AirTravel #FlightSafety #9/11 #AlJazeeraEnglish