This article originally appeared on Time.com.
“We know that travelers value our commitment to excellent operational performance, and today we did not deliver on that commitment,” Gil West, Delta’s chief operating officer said in a statement. “We want our customers to know we are thoroughly investigating the matter and that we are truly sorry.”
Delta CEO Ed Bastian also apologized in a video posted on Twitter.
Hundreds of flights were cancelled and hundreds more were delayed earlier in Monday, leaving many passengers stranded after a loss of power in Atlanta that “affected Delta computer systems and operations worldwide.”