(Bloomberg) -- Delta Air Lines Inc. struggled to restart its worldwide operations today after a computer failure halted flights for hours and grounded thousands of passengers.

About 300 flights were scrapped and delays and cancellations will continue even as systems come back online, the second-biggest U.S. carrier said Monday on Twitter. A power failure at Delta’s Atlanta base beginning at 2:38 a.m. local time disrupted computer operations, according to the airline. The interruption was limited to Delta, a spokesman said.

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