The top 20 airports are:
1. Incheon International Airport, Seoul2. Singapore Changi Airport
3. Hong Kong International Airport
4. Amsterdam Schiphol Airport
5. Beijing Capital International Airport
6. Munich Airport
7. Zurich Airport
8. Kuala Lumpur International Airport
9. Vancouver International Airport
10. Central Japan International Airport
11. London Heathrow Airport
12. Copenhagen Airport
13. Auckland International Airport
14. Tokyo International Airport Haneda
15. Frankfurt Main Airport
16. Shanghai Hongqiao International Airport
17. Narita International Airport
18. Abu Dhabi International Airport
19. Kansai International Airport
20. Sydney Airport