Transportation secretary Sean Duffy says the airspace is now open and the problem has been identified Chaos at US airports as stoppage grinds travel plans to a halt What to know about the rare nationwide ground stop issued by the FAA Flights in the US have slowly started resuming after being grounded for several hours on Friday due to a major communications outage, but authorities have warned that a return to normal operations will take time. The Federal Aviation Administration (FAA) lifted a nationwide ground stop about four hours after it was declared on Friday afternoon, delaying or canceling more than 11,000 US flights, according to aviation tracker FlightAware , and throwing airports into sudden chaos. Continue reading...
Flights slowly resume after US aviation agency lifts nationwide ground stop

Original reporting
The Guardian: read the full reportFollow this story
Earlier reports and follow-ups on the same developing story.
- · Ars TechnicaFAA has lifted its third-ever nationwide ground stop
- · BBC News'We'll get home one day' - US travellers impacted by nationwide ground stop
- · The VergeFAA lifts nationwide ground stop that blocked takeoffs for hours
- · Al JazeeraUS blames system upgrade for longest nationwide FAA ground stop since 9/11
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