American Airlines grounds entire fleet after reporting computer glitch

Computer systems restored after intermittent outages but airline cautions that delays and cancellations are still expectedAmerican Airlines said its computer systems were restored after intermittent outages that lasted several hours on Tuesday, but it cautioned that flight delays and cancellations were still expected for the rest of the day.

The problems led American to ground its flights for much of the afternoon, stranding travelers across the country. American, a unit of AMR Corp, operates more than 3,500 daily flights worldwide.

The AMR Corp unit added in a statement that it saw no evidence that its technical outage was related to recent events in Boston.

Other carriers have also had problems with system outages. Last year, computer outages at United Continental Holdings stranded passengers at airports around the country.

American plans to merge with rival US Airways Group to form the world's biggest air carrier.