Flights across the United States were halted due to a failure with the Federal Aviation Administration’s Notice to Air Missions (NOTAM) system early Wednesday morning.

This system directs crucial information regarding flight conditions to pilots, such as if lights are out on a runway.

The Lake Charles Regional Airport and Chennault International Airport did not experience any flight cancellations, according to FlightAware.

Heath Allen, Lake Charles regional airport executive director, confirmed this.

“Usually, we have two flights out in the morning, one for American Airlines and one for United Airlines,” he explained.

The American Airlines flight Wednesday morning took off before the outage, while the United Airlines flight was delayed until about 10 a.m, Allen said.

The New Orleans International Airport experienced 14 canceled flights.

Nationwide thousands of flights experienced delayed departures. All domestic departures were initially paused until 8 a.m. Central Time “to allow the agency to validate the integrity of flight and safety information,” the FAA stated on Twitter.

At about 7:30 a.m., the FAA lifted the ground stop and air traffic operations nationwide began to resume. Despite this, thousands of travelers found themselves without a flight.

As of 2:30 p.m. Wednesday, 8,609 flights within, into or out of the United States were delayed and 1,261 flights were canceled, according to flight-tracking site FlightAware. More than 21,000 flights were originally scheduled to take off of U.S. soil Wednesday, and 1,840 international flights were expected to fly into the U.S., according to aviation data firm Cirium.

U.S. Press Secretary Karine Jean-Pierre said President Joe Biden was briefed by Secretary of Transportation Pete Buttigieg Wednesday morning regarding the FAA system outage. “There is no evidence of a cyberattack at this point, but the president directed DOT to conduct a full investigation into the causes,” she said.

In an interview with MSNBC, Buttigieg confirmed this, saying, “there is no direct indication of any kind of external or nefarious activity, but we are not yet prepared to rule that out.”

The outage did not affect any military operations or mobility, Air Force Col. Damien Pickart, Air Mobility Command spokesman, confirmed. This meant all troop movement and supply flights continued as business as usual. Air Mobility Command was working alongside the FAA to resolve the issue.