For the second straight day, the American Airlines Web site went down on Friday, inconveniencing customers trying to book flights or check reservations.
American spokesman Billy Sanez said Friday's interruption started shortly after 3 p.m. EDT. The Web site was unavailable for more than 90 minutes before returning shortly before 5 p.m.
Sanez said the problem appeared to be a network issue, but an IT team was still examining the system.
During the outage, a placeholder page at aa.com directed visitors to call the airline's reservations centers.
Sanez said customers who did so would not be charged the customary fee for using the centers.
American, the nation's largest airline and a unit of AMR Corp., has been trying like other carriers to push more customers to its Web site rather than reservations centers to save money.