The Federal Aviation Administration says the outage affecting a computer system Wednesday morning has been fixed, and air traffic is able to resume.
"Normal air traffic operations are resuming gradually across the U.S. following an overnight outage to the Notice to Air Missions system that provides safety info to flight crews. The ground stop has been lifted. We continue to look into the cause of the initial problem," the FAA tweeted at 7:50 Wednesday morning, more than two hours after announcing the system had led to flights across the country being grounded.
At DFW, flights started resuming immediately, but the airport warned delays and cancellations would continue because crews and airplanes had been left out of place.
"If you are scheduled to fly into or out of DFW today, please continue to check with your airline for your flight's latest status," the airport tweeted at 8 am.
"Well, just one step at a time, and a lot of times, we don't know what we're doing," a woman flying to Seoul, South Korea with her husband said as they waited in Terminal D and were checking for schedule changes.
"When I woke up this morning, my husband told me there's a glitch, and flights are being delayed," one woman with a flight to Miami and then Bogota, Colombia said. "I said, 'Oh no, that cannot be.' I'd been hearing a lot about flight delays, so I thought, 'Oh no.'"
She said her flight to Miami was still listed as "on time," but she was meeting friends in Miami who were flying from other airports. She said she worried she might get to Miami and then not have a plane to travel on to Bogota.
"I keep looking at my phone, and it says, 'on time, on time.' Then I checked in, and it says, 'on time,' so right now I feel a little good," she said.
During the outage, American Airlines said it was working with the FAA to minimize disruptions but urged people to continue checking the airline's website and app for changes to the schedule.
By Wednesday afternoon, most flights at DFW were on time, but many were still delayed or cancelled.
At Love Field, Southwest Airlines said it was "closely monitoring a data issue with the FAA that may impact the start of operations today." The airline also urged passengers to check its website and app for changes to the schedule through the day.
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