6. Chongqing Jiangbei International Airport (Chongqing, China)
Another airport most people have probably never heard of, Chongqing Jiangbei International Aiport (CKG) saw 34.9 million passengers in 2020. CKG jumped from 48th busiest in 2019 to 6th busiest in 2020 thanks to more steady traffic than most hubs around the world during COVID.