Ryanair takes online security very seriously. That’s why we require you to enter your credit/debit card verification number (CVV) or card identification number (CID) for American Express cards before we can process your payment.
The CVV is the last three-digit number printed on the signature panel located on the back of your card. The CVV/CID is a security feature that allows Ryanair and your credit card issuer to identify you as the cardholder and provide you with additional security against fraud.