NEW YORK (NEWSnet/AP) — Airlines, including Delta Air Lines, continue to struggle to restore operations two days after a faulty software update caused technological chaos worldwide and resulted in several carriers grounding flights.

Total cancellations within, into or out of the U.S. on Sunday clocked in at 1,461, according to the latest data from FlightAware. Delta and United Airlines topped the cancellations.

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Delta Chief Executive Ed Bastian said in a message to customers Sunday that flight cancellations continued as the airline tried to recover its systems and restore operations. He noted that the pause in Delta’s operations resulted in more than 3,500 Delta and Delta Connection scrubbed flights.

The company has been offering waivers to affected customers.

Bastian noted that that one of their crew tracking-related tools was affected and unable to effectively process the unprecedented number of changes triggered by the system outage.

“The technology issue occurred on the busiest travel weekend of the summer, with our booked loads exceeding 90%, limiting our re-accommodation capabilities,” Bastian wrote. “I want to apologize to every one of you who have been impacted by these events.”

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