UPDATE: American Airlines flights flying again after nationwide computer glitch

American Airlines notified KRMG at 3:30 P.M. that the airline's systems have been fully restored.

AA still expects continued flight delays and cancellations throughout the remainder of the day.

The airline tells KRMG that several options available to customers:

• If customers must travel today and are already at the airport, they can rebook on another airline by visiting an American Airlines agent or by going to the other airline's ticket counter with their electronic ticket number.
• If customers must travel today and are not yet at the airport, they can rebook through American Airlines reservations or through another carrier and American will honor the fare difference.
• If a customer chooses not to travel today, there will be no charge for reservation changes or a full refund will be provided.

Airline officials stress that they see no evidence that today’s technical outage is related to the tragic events in Boston.

AA's reservation and booking tool, called SABRE, reportedly went down shortly after 11:00 A.M. Tuesday morning.

American, a division of AMR, has more than 3,500 flights daily worldwide.

Originally, AA said it would resume flights at roughly 2:00 P.M. Central, but it appears it had been unable to restart the SABRE system until 3:30 P.M.