Take context from the input text and decide on the accurate relationship between 'Xiamen Airlines' and 'China Southern Airlines' from the options provided.
Options: location of formation, original broadcaster, parent organization, distributed by

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.
parent organization