In the context of the input sentence, determine the relationship between 'Xiamen Airlines' and 'China Southern Airlines'.
Options: distributed by, distribution format, owned by, director/manager

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