American Airlines says that its reservations systems have been restored following an outage that halted its flights this afternoon.
The Fort Worth-based carrier did not comment on the cause of the outage but it said in a tweet earlier today that the issue was with its ability to access its reservations system, which is powered by Sabre. It specified in the tweet that this was not an issue with Sabre.
The US Federal Aviation Administration (FAA) instituted a ground stop for flights on American and its regional affiliate American Eagle "going into several major cities" at the request of the airline, says the regulator.
American says that 670 flights were cancelled as a result of the outage. It operates more than 3,500 flights per day.
"As of 3:30pm CDT [central daylight time], our systems have been fully restored, however we expect continued flight delays and cancellations throughout the remainder of the day," says American.