Southwest Airlines says its flights and bookings are back on track after computer system crashes on Wednesday scrambled the Dallas-based carrier’s flights for four straight days.

Southwest (NYSE: LUV) late Sunday reported a full recovery across its flight network. The airline had 2,300 cancellations and thousands of delays from Wednesday afternoon through Saturday evening.

Southwest Airlines CEO Gary Kelly on Thursday blamed the initial problem on a router and called the ensuing computer malfunctions the worst outage in the airline's history.

The airline repeatedly apologized to customers and said it would allow customers ticketed to fly during the disruption to rebook flights free through within two weeks of their original date of departure. Southwest also extended a fare sale that had been set to expire.

“We are grateful to our Employees for their dedication and our Customers for their patience, loyalty, and understanding as we worked to rebuild,” Linda Rutherford, Southwest’s vice president of Communication said Sunday in a post on the company’s corporate blog.

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