US flights return to normal after nationwide ground stop as cause remains unclear

The US Transport Secretary Sean Duffy says flight operations are returning to normal after Friday's nationwide ground stop, but it's still unclear exactly what led to the disruption. Planes were halted for more than four hours, affecting more than 15,000 flights. Thousands of passengers are still stranded as airlines warn the knock-on effect could last for days. Duffy is blaming outdated technology and says maintenance work was being carried out before the outage. Subscribe to our channel: bit.ly
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