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Passengers wait for answers as Delta addresses a nationwide technical issue.

ATLANTA - A system outage at Delta Air Lines left passengers grounded around the country for several hours Sunday evening. The airline halted all takeoffs during the outage. By midnight, the Atlanta-based airline said its computer systems were back up and running at Hartsfield-Jackson International Airport, and flights were once again departing.

The airline said later that at least 150 flights were canceled Sunday because of the outage.

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