List of busiest airports by international passenger traffic

Columns: Rank | Airport | Location | Code ( IATA/ICAO ) | Total passengers | % change
1 | London Heathrow Airport | Hillingdon , Greater London , United Kingdom | LHR/EGLL | 66,689,466 | 3.5% | 2 | Dubai International Airport | Garhoud , Dubai , United Arab Emirates | DXB/OMDB | 65,872,250 | 15.3% | 3 | Hong Kong International Airport | Chek Lap Kok , Islands , New Territories , Hong Kong | HKG/VHHH | 59,294,439 | 6.5% | 4 | Paris-Charles de Gaulle Airport | Roissy-en-France , Val d'Oise , Île-de-France , France | CDG/LFPG | 56,767,748 | 1.0% | 5 | Singapore Changi Airport | Changi , East Region , Singapore | SIN/WSSS | 52,775,360 | 5.7% | 6 | Amsterdam Airport Schiphol | Haarlemmermeer , North Holland , Netherlands | AMS/EHAM | 52,527,699 | 3.0% | 7 | Frankfurt Airport | Flughafen , Frankfurt , Hesse , Germany | FRA/EDDF | 51,315,550 | 1.1%

Example questions:
What is the code of the one of the busiest airports by international passenger traffic that has been in commercial operation since 1998 ? | What is the code of the airport that is the second-busiest airport by international passenger traffic in Europe ? | What is the code of the airport that is the second busiest airport in the world by international passenger traffic ? | What is the code of the one of the busiest airports by international passenger traffic that is currently rated the World 's Best Airport by Skytrax ?

Answers:
HKG/VHHH | CDG/LFPG | LHR/EGLL | SIN/WSSS