Hundreds of U.S. flights were delayed Wednesday morning after the Federal Aviation Administration suffered an outage of the system that sends messages to pilots.

The FAA said on its website that domestic departures would be paused until 9:30 a.m. ET. The agency said it was working to restore the Notice to Air Missions System.

The White House said Transportation Secretary Pete Buttigieg had briefed President Joe Biden on the outage. “There is no evidence of a cyberattack at this point, but the President directed DOT to conduct a full investigation into the causes,” White House press secretary Karine Jean-Pierre said in a tweet.

More than 2,500 U.S. flights were delayed on Wednesday by shortly before 8 a.m. ET, according to FlightAware.

“This technology issue is causing significant operational delays across the National Airspace System,” said Airlines for America, an industry group that represents major U.S. carriers, including Delta, American, United, Southwest and others.

Austin-Bergstrom International Airport in Texas said in a tweet that arriving and departing passengers should expect delays throughout the day.

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