The Federal Aviation Administration posted a nationwide groundstop order for all American flights at the request of the airline, according to an advisory notice.

New York (CNN) — American Airlines said a “technical issue” is delaying all of its flights in the United States during one of the busiest travel periods of the year.

“A technical issue is affecting American flights this morning,” an airline spokesperson told CNN. “Our teams are working to resolve the issue as quickly as possible, and we apologize to our customers for the inconvenience.”

The Federal Aviation Administration posted a nationwide groundstop order for all American flights at the request of the airline, according to an advisory notice.

Customers on social media began complaining early Tuesday morning that some flights were returning to their gates and that delays are about 90 minutes. An AA representative on X said an “estimated timeframe has not been provided.”

American Airlines’ (AAL) stock fell nearly 3% in premarket trading.

This is a developing story. It will be updated.

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