As of 12:30pm (EDT), Delta said it had cancelled 278 flights on the day, adding to the more than 1,600 cancellations since Monday. Another 1,950 flights departed on Wednesday, with 75 percent of them within 30 minutes of their scheduled times, the airline said. 2 U.S. airline by passenger traffic, said systems that allow customer service agents to process check-ins and dispatch aircraft are now functioning normally. "Delta still remains the best operation in the industry by a wide margin," McKenzie said, noting that the airline had canceled far fewer flights than rivals in recent years. Delta said problems arose when critical systems did not switch over to a backup source following a power surge and outage on Monday.

Source: Otago Daily Times August 10, 2016 18:33 UTC