Passengers at Chicago's O'Hare International Airport saw flight-information boards full of cancellations and delays during the FAA's ground stop on Friday. Jacek Boczarski/Anadolu via Getty Images
Roughly 12,500 flights were canceled after an hourslong ground stop for all US flights on Friday.
Transportation Secretary Sean Duffy said he's looking into whether an FAA contractor made a mistake.
While flights resumed late on Friday evening, widespread travel disruption is expected for days.
Widespread travel disruption is expected across the US this weekend as aviation recovers after all flights in the country were grounded on Friday afternoon.
The…
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