Does the subject want to ask, "Why does Turkish Airlines have to fill in a credit card company to buy a ticket?" Pay for air tickets, handle refunds or disputes.

1. Air ticket payment: Credit card is one of the commonly used payment methods when purchasing air tickets. Filling in the credit card company information can enable Turkish Airlines to verify the identity of the payer and credit card information to ensure the safety and effectiveness of payment.

2. Deal with refund or dispute: If there is a problem with air ticket reservation or a refund is needed, Turkish Airlines can contact passengers through the credit card company and handle the refund or resolve the dispute. Filling in the credit card company information will help speed up the processing and improve the efficiency of solving problems.