Does China Southern need to participate in overflow bidding SMS?

Need. China Southern Airlines can change the follow-up flight and refund the ticket for free if it overflows the bidding SMS, and the passengers who agree to change the ticket can get some cash compensation. It has many advantages and needs to participate. The full name of China Southern Airlines is China Southern Airlines Co., Ltd., headquartered in Guangzhou, with a blue vertical tail inlaid with red kapok as the company logo.