Fire-fighting vehicles spray water to welcome a cargo plane at the Huanghua International Airport in Changsha, capital of central China's Hunan Province, July 21, 2018. The Changsha-North America regular continental cargo airline, the first of its kind in Hunan Province, made a successful trip on Saturday. Three chartered freight planes flying between Changsha and North America every week are expected to shorten transport time and lower operation cost. (Xinhua/Zhang Xiaoyu)