Buy a ticket and fill out a form to become a member, or you can apply for a corresponding credit card at a cooperative bank.
The frequency of flying is small, and there are no discounts for members, because there are levels.
If you fly frequently and accumulate more points, you will get mileage rewards, and It means using reward miles to exchange for free air tickets.
In addition, high-level members will receive VIP treatment and care in the terminal and on the plane.