3. Chengdu Shuangliu International Airport (Chengdu, China) Chengdu Shuangliu International Airport (CTU) saw 40.7 million passengers in 2020. Although it saw 27.1% fewer travelers in 2020 vs 2019, CTU was still the 3rd busiest airport in the world. < Prev page: 4. Dallas/Fort Worth International Airport (Grapevine, Texas) | Next page: 2. Hartsfield-Jackson Atlanta International Airport (Atlanta, Georgia) >