Taiwan Taoyuan International Airport ranks 18th among the world's 100 best airports, five places down from last year, according to the Skytrax 2020 World Airport Awards released Monday. The airport did best in the category of Best Airport Immigration, in which it ranks second, compared with fourth last year, according to the list, which is based on votes by customers in the world's largest annual airport customer satisfaction survey carried out over a 6-month period.