1. Pay attention to privileges and rights: Before using the food black card, you should read the relevant rights carefully and make full use of these privileges. For example, some black cards can enjoy VIP rooms and car rental discounts at VIP airports.
2. Accumulate mileage: eat black cards and cooperate with airlines. Holding a black card can accumulate a lot of mileage. When purchasing air tickets, priority should be given to using black cards to pay, so as to accumulate more miles, which can be exchanged for free air tickets or upgraded cabins.