5. Shenzhen Bao’an International Airport (Shenzhen, China)
Shenzhen is one of China’s largest cities and an international technology hub, so it’s no surprise that the airport saw 37.9 million passengers in 2020. Schenzhen Bao’an International Airport (SZX) jumped from 26th busiest in 2019 to 5th busiest in 2020.