TOKYO, Dec 26 (Reuters) - Japan Airlines ( JPNRF )

said on Thursday it was hit by a cyberattack that caused delays

to some domestic and international flights.

The attack began at 7:24 a.m. (2224 GMT) and affected the

company's internal and external systems, JAL said. The company

said it temporarily shut down a router that was causing system

malfunctions and also suspended ticket sales for flights

departing on Thursday.

ANA Holdings ( ALNPF ), Japan's other major air carrier, saw

no signs of an attack on its systems, a spokesperson said.

Earlier this week, American Airlines ( AAL ) briefly

grounded all flights for an hour, disrupting travel for

thousands on Christmas Eve, due to a technical glitch involving

its network hardware.

(Reporting by Mariko Katsumura, Kantaro Komiya, Maki Shiraki,

and Rocky Swift; Editing by Christian Schmollinger and

Muralikumar Anantharaman)