https://www.reuters.com/article/us-marriott-intnl-cyber/marriotts-starwood-hack-hits-up-to-500-million-customers-idUSKCN1NZ1D0

Marriott International Inc said on Friday that hackers accessed up to 500 million customer records in its Starwood Hotels reservation system in an attack that began four years ago, exposing data including passport numbers and payment cards.