Flights Grounded Across US After FAA System Failure

Flights across the United States were grounded early Wednesday, as airlines coped with a Federal Aviation Administration system failure that it said early Wednesday was “beginning to come back on line.”

The full extent of the delays was not immediately known, and some flights were taking off, but the delays were spread across several airlines. More than 1,100 flights within, into and out of the United States had been delayed on Wednesday, and more than 90 were canceled, according to FlightAware, a flight tracking company.

United Airlines said in a statement that it had temporarily delayed all domestic flights and that it would issue an update when it learned more from the F.A.A. American Airlines said the situation “impacts all airlines” and that it was “working with the F.A.A. to minimize disruption to our operation and customers.”

Pete Buttigieg, the secretary of transportation, said on Twitter that he had been in touch with the F.A.A. “about an outage affecting a key system for providing safety information to pilots.”

“FAA is working to resolve this issue swiftly and safely so that air traffic can resume normal operations, and will continue to provide updates,” he said.

On social media, would-be passengers across the United States said their flights had been delayed, some reporting that their pilots or airline representatives had cited the F.A.A. technical problem. Several airports advised passengers to check with their airlines for the latest information.

This is a developing story.