As far as I know, CCB’s China Southern Airlines Dragon Card Platinum Card starts with these six digits. See the picture for details:

China Southern Airlines Dragon Card is jointly issued by CCB and China Southern Airlines In addition to the basic financial functions of China Construction Bank credit cards (consumption first, repayment later, recycling of credit, installment payment and other basic financial functions), the airline co-branded credit card also provides high-value aviation guarantees and preferential mileage redemption (Platinum cards are based on consumption points at a rate of 14 to 1 proportion, automatically converted into China Southern miles), exclusive priority services, platinum secretarial services and a number of promotional activities.

At the same time, the platinum-level China Southern Airlines Dragon Card also has the preferential benefit of allowing foreign currency transactions to be recorded in RMB and free of currency exchange fees, and has a high credit-price ratio.