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

Ticket sales are back up and running after being halted as a result of the incident, the airline said in a statement at 2:19pm Tokyo time. 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.

While Christmas Day 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 Christmas Eve, 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 US flights. That halt lasted for about an hour. – Bloomberg