 AirHelp is out with its annual list of the world's best airports. It's based on customer feedback, on-time performance, and quality of food and shopping options. Taking the crown this year is Hamad International in Qatar, followed by Cape Town in South Africa and Chubu in Japan. Just one U.S. airport cracks the top 10, Salt Lake City, which opened a new facility in 2020 with the final phase expected to be completed this fall.