U.S. hubs were absent from the top 10 list based on an airport customer survey thatâs been conducted annually since 1999. Changi Airport -- which handled a record 62.2 million passengers last year -- has been expanding its capacity to meet rising demand for air travel. The airport is building its fifth terminal, a third runway, as well as a shopping-and-dining facility called the Jewel as passengers increase. [Bloomberg]