I can definitely tell you that the nearest bus stop to the airport is Beigangqiao long-distance passenger station, and there is indeed a Dandong bus there, but whether you can get a ticket depends on your luck. It costs 3 yuan to get there by taxi. You can take the bus at Jianshe Street in Dashishidao and get off at Beigang Bridge. The bus in Dalian drives very fast. Hehe, good luck.