DALLAS (AP) — Delta Airlines is working to get stranded travelers on their way following a major computer glitch.

At least half of all Delta flights were delayed or cancelled Monday after a power outage knocked out the airlines computer systems.

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Delta says the systems were back up and running after a few hours, but the damage of delays and backups was already done.

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

Delta spokesman Trebor Banstetter said 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.

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A spokesman for Georgia Power said the company believes a failure of Delta equipment caused the airline’s power outage. He said no other customers lost power. Delta declined to comment on the power company’s report.

Tuesday’s challenge is finding 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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