EasyJet have reported news of a sophisticated cyber-attack in January, the company admitted that over 9 million customer details have been accessed, these include email addresses, travel details & payment information.
If you are an EasyJet customer, we strongly recommend changing your (EasyJet) account password. If you use the same email and password combination on any other website, we also recommend changing your password there as soon as possible. Please be extra vigilant of phishing/fake emails sent from "EasyJet" and finally check bank statements for fraudulent activity.
For more information follow this BBC news link