(Reuters) -Canadian carrier WestJet said on Monday the personal information of some passengers was exposed in a cybersecurity breach earlier this year, though no payment data was compromised. The aviation industry's growing dependence on complex digital systems and vast stores of passenger data has made it an increasingly attractive target for cybercriminals. WestJet said the type of data exposed in the breach varied but could include names, contact details, travel information and documents tied to reservations. However, no credit card and debit card numbers, expiration dates and CVV numbers were obtained during the breach. It also notified relevant authorities, including the attorneys general of U.S. states where residents were affected.