Japan Airlines Co. said it has resumed ticket sales for international and domestic flights after resolving a system malfunction caused by a cyberattack on the morning of December 26.

Ticket sales are back up and running after being halted as a result of the incident, the airline said in a statement at 2:19 pm Tokyo time, December 26. Systems have been restored without any leakage of customer data, and there is no virus damage, the company said.

Twenty-four domestic flights experienced delays of at least 30 minutes due to the issue as of 11 a.m., the carrier said previously, but the problem hadn’t impacted flight safety or delayed overseas services.

JAL’s shares rose as much as 0.4% after the company reported the resolution, staging a recovery from a 2.5% fall in morning trade in Tokyo.

JAL Flight Info@JALFlightInfo_e 

【Network failure in progress as of 10:00AM】 We identified and addressed the cause of the issue. We are checking the system recovery status. Sales for both domestic and international flights departing today have been suspended. We apologize for any inconvenience caused.

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While Christmas Day, December 25, isn’t a public holiday in Japan, the glitch nevertheless came during the peak winter travel season when many people take time off.

Separately, Japan Post Holdings Co. said in a statement that it was experiencing nationwide delays in the delivery of mail as a result of the JAL issue. 

On December 24, American Airlines Group Inc. said that a technical issue with DXC Technology Co., a third-party vendor that maintains the carrier’s flight-operating systems, caused a brief ground stop on all U.S. flights. That halt lasted for about an hour.