The airline said a power outage in Atlanta early Monday morning caused the dilemma, which is happening “systemwide,” according to a statement. Flights in transit at the time of the outage were unaffected.
“I apologize for the challenges this has created for you with your travel experience,” Delta CEO Ed Bastian said in a statement Monday afternoon. “The Delta team is working very, very hard to restore and get these systems back as quickly as possible.”
As of 1:30 PM ET, Delta had cancelled 451 flights but operated 1,679 of its approximately 6,000 flights schedule for Monday.
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