generally, you need to show a certificate. There are regulations on Cathay Pacific's official website, but the people in the customer service center are also vague. Other airlines also have such a rule, most of which stipulate that it doesn't matter if you pay by debit card. If you pay by credit card, you need to hold a card when boarding, otherwise the credit card owner will have to show the relevant materials. I suggest you contact Air China now to verify this situation.