DALLAS — Delta Air Lines will be handing out refunds and travel vouchers as penance for the latest computer outage to knock a major airline off stride.

Delta canceled more than 700 flights and had 2,600 others delayed, some for hours, after a power outage Monday at its Atlanta headquarters caused many computer systems to crash.

The systems were working again a few hours later but Delta said it was still working to accommodate stranded passengers.

Its challenge today will be to find enough seats on planes during the busy summer vacation season to accommodate the thousands of passengers whose flights were scrubbed. Last month, the average Delta flight was 87 percent full.

The airline posted a video apology by CEO Ed Bastian. And it offered refunds and $200 in travel vouchers to people whose flights were canceled or delayed at least three hours.

For passengers, hardship from the early morning meltdown was compounded by the fact that Delta’s flight-status updates weren’t working either. Instead of being able to stay home, many passengers only learned about the flight problems when they arrived at the airport.

“By the time I showed up at the gate the employees were already disgruntled, and it was really difficult to get anybody to speak to me or get any information,” said Ashley Roache, whose flight from Lexington, Ken., to New York’s LaGuardia Airport was delayed. “The company could have done a better job of explaining ... what was happening.”

Delta spokesman Trebor Banstetter said that after a power outage at the company’s Atlanta headquarters, some key systems and network equipment did not switch over to backup systems. He said the airline’s investigation into the cause of the outage was continuing but said there were no indications of hacking.