Flight operations at Southwest Airlines returned to normal Sunday morning after a router failure had caused the cancellation of approximately 2,300 flights over four days.

“We are grateful to our employees for their dedication and our customers for their patience and loyalty as we worked to rebuild our operations after a technology outage on Wednesday, July 20,” the carrier said in a statement. “The Southwest Airlines customer-relations team continues to work directly with those customers impacted and inconvenienced by the disrupted operations.”

The router, along with its backup, was down for approximately 12 hours beginning last Wednesday afternoon. Complications as Southwest played catch-up for the next few days led to continuing cancellations into the weekend.

Anyone who holds Southwest tickets from this past Wednesday through this Tuesday won't have to pay any differences in fare when they rebook within two weeks of their original date of departure.

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