Delta is investigating why some critical systems and network equipment didn't switch over to its backup systems following the power loss, the carrier said in a statement.
The Transportation Department said it also made sure Delta provided information about customer refunds on its website and was reviewing the consumer complaints that it had received. Debbie McGarry left Switzerland on Monday and was still stuck Tuesday at the Atlanta airport, far from her Arizona home. "I thought there might be a fistfight".
The airline is attempting to recover from a computer problem that began Monday morning and resulted in the cancellation of about 1,000 flights Monday, leaving some passengers stranded. The airline was back online after a number of hours Monday, but the outages were so widespread that it is still dealing with the ripple effects a day later. While flights resumed in the morning, Delta spokeswoman Hiroko Okada said more delays were expected.
San Francisco International Airport reported that operations with Delta flights seemed to be back to normal, while officials at the San Jose airport reported just three cancellations and two delayed flights.
Delta's challenge Tuesday was to find enough seats on planes during the busy summer vacation season to accommodate the tens of thousands of passengers whose flights were scrubbed.
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The retailer was facing intense competition in the teen retail environment by the likes of fast-fashion brands H&M and Forever 21. Revenue as well as earnings were down on a year-over-year basis in Q2, as were same-store sales.
Airlines have been putting more people in each plane, so when a system of a major carrier crashes, as has happened with others before Delta, finding a new seat for the waylaid becomes more hard. Last month, the average Delta flight was 87% full.
For passengers, hardship from the early morning meltdown was compounded by the fact that Delta's flight-status updates weren't working either.
The company said it's continuing to investigate what exactly went wrong. He said no other customers lost power.
Last month, Southwest Airlines issued formal apologies and a host of rebates to passengers affected by 2,300 cancellations and 8,000 delayed flights when its computer systems, already taxed by an airline merger in 2010, collapsed.
Tuesday's interruptions to America's second largest airline can be attributed to Monday's system-wide power outage at Delta's headquarters in Atlanta.