Utilize the input text as a context reference, choose the right relationship between 'Xiamen Airlines' and 'China Southern Airlines' from the options.
Options: distributed by, owned by, director/manager, distribution format

Chinese carriers, boosted by drops in fuel costs, were the region’s most successful, with China Eastern Airlines, Hainan Airlines, Cathay Pacific Airways, China Southern Airlines and Xiamen Airlines all making it in the top 25 rankings.
owned by