Japan Airline customers' data leaked

Japan Airlines, or JAL, says personal information of up to 750,000 customers of its miles program had been leaked due to a cyber attack, without confirming if banking details had also been affected.

The leak was due to an "unauthorised access" to JAL's database by an external server, an airline official told the local news agency Kyodo on Wednesday.

The attack affects the data of between 110,000 and 750,000 members of the airlines' miles club that grants passengers points for flying with the airlines and gives them discounts on subsequent flights.

JAL has not yet confirmed if the customers' passwords or banking account and card details have also been leaked.