Delta Air Lines U.S. flights grounded because of 'systems outage'

Delta Air Lines has grounded its domestic flights because of "automation issues," according to an advisory Sunday by the Federal Aviation Administration.

Delta spokesman Morgan Durrant said that the airline was facing a "systems outage" and that flights already in the air were unaffected.

Tampa International Airport spokeswoman Janet Zink said that eight arriving flights Sunday night were delayed by one to three hours, and five departing flights were delayed, though she could not provide a time estimate on when they might take off.

The Atlanta-based airline is responding to customer complaints on Twitter by saying it is experiencing technical issues and is "working hard to get them fixed quickly to minimize the impact to our customers."

The FAA says international flights are exempt from the grounding.

In August, Delta suffered a computer breakdown after a power outage in its operations center. The airline canceled more than 2,000 flights over three days.