World Singapore Changi: Behind the scenes at the world’s No. 1 airport November 22, 2018November 22, 2018Ben Mutzabaugh, USA TODAYComments Off on Singapore Changi: Behind the scenes at the world’s No. 1 airport Airport is the main hub for Singapore Airlines and was the 18th-busiest airport in the world in 2017. It's also home to the world's longest flight.