Korean Air and Asiana Airlines notified customers of reservation-information exposure through unauthorized access using an Amadeus IT Group system account. Reporting says booking references and related details were involved, while the exact scope and timing remain under investigation. The airlines say separately processed payment data was not included and there is no indication of direct intrusion into their own networks. Messages that appear to know a booking should still be checked through official channels rather than unknown links, attachments or requests for more personal information.