00:00A plane taking off in Houston on Friday evening after the United States' Federal Aviation
00:06Administration lifted a rare nationwide ground stop.
00:09The over four-hour stoppage, the longest since the September 2001 terrorist attacks, brought
00:15all air travel to a halt across the country and stranded tens of thousands of passengers.
00:21It was implemented on Friday afternoon after outdated air traffic communications equipment
00:27became overloaded with data and began to fail.
00:30Transportation Secretary Sean Duffy said the issue had affected the regional air traffic
00:35control centers that direct planes between airports nationwide.
00:40He said air traffic control systems have not been updated because of a lack of congressional
00:45funding and called for $50 billion in upgrades to the system.
00:51Duffy warned that departures would resume gradually and that with some 10,000 flights
00:56canceled, it could take days for airlines to restore normal operations.
01:02President Donald Trump and the Homeland Security Secretary said there was no sign of a cyberattack.
