American Airlines has issued a ground stop for its entire fleet, citing computer issues at the hubs in Chicago, Dallas and Miami.
Airport computers are not allowing customers to check in, the airline confirmed. Passengers can still check in on their home computers or cell phones.
Thousands of passengers are currently stranded at Miami (MIA), Chicago O’Hare (ORD) and Dallas-Fort Worth (DFW) international airports.
American Airlines serves 344 destinations with a fleet of 945 aircraft. It is the world’s largest airline by fleet size and revenue.
"We’re working to resolve technical issues impacting several airports as quickly as possible," the airline said in a statement. "We will provide updates and more information as they become available. We apologize to our customers for the inconvenience."