Landlord, it depends on which airline you prefer, because different airlines will have cooperative relations with different banks. According to my personal experience, if there are many flights by Air China, it is more favorable to apply for ICBC's aviation joint platinum card, and there will be different preferential activities. If there are many flights on China Southern Airlines, it is most practical to apply for a joint platinum card of Guangfa Bank, because every time you spend 7 yuan RMB, you will accumulate 1 China Southern Airlines mileage, depending on the individual landlord.