The main cause of the merger is the increasing competition with some of the major U.S. airliners who are able to offer direct service flight for the most popular business routes.
여기 문장에서 관계 대명사를 왜 who 로 썼나요? 선행사인 airliners가 '항공사들'이라서 'which'써야 하는 것 아닌가요?
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