What are some common airport and country codes?
Top 30 Country Codes (by population)

Top 30 Airport Codes (busiest airports)
Hartsfield-Jackson Atlanta International | Atlanta, Georgia, USA | ATL |
Beijing Capital International Airport | Beijing, China | PEK |
Los Angeles International Airport | Los Angeles, California, USA | LAX |
Tokyo Haneda Airport | Tokyo, Japan | HND |
Dubai International Airport | Dubai, UAE | DXB |
O'Hare International Airport | Chicago, Illinois, USA | ORD |
London Heathrow Airport | London, UK | LHR |
Shanghai Pudong International Airport | Pudong, Shanghai, China | PVG |
Charles de Gaulle Airport | Île-de-France, France | CDG |
Dallas / Fort Worth International Airport | Dallas-Fort Worth, Texas, USA | DFW |
Guangzhou Baiyun International Airport | Guangdong, China | CAN |
Amsterdam Airport Schiphol | North Holland, Netherlands | AMS |
Hong Kong International Airport | Hong Kong, China | HKG |
Frankfurt Airport | Frankfurt, Germany | FRA |
Denver International Airport | Denver, Colorado, USA | DEN |
Seoul Incheon International Airport | Incheon, South Korea | ICN |
Singapore Changi Airport | Changi, Singapore | SIN |
Indira Gandhi International Airport | Delhi, India | DEL |
Suvarnabhumi Airport | Samut Prakan, Thailand | BKK |
Soekarno-Hatta International Airport | Banten, Indonesia | CGK |
John F. Kennedy International Airport | Queens, New York, USA | JFK |
Kuala Lumpur International Airport | Selangor, Malaysia | KUL |
Madrid Barajas Airport | Barajas, Madrid, Spain | MAD |
San Francisco International Airport | San Mateo County, California, USA | SFO |
Chengdu Shuangliu International Airport | Chengdu, Sichuan, China | CTU |
Shenzen Bao'an International Airport | Shenzen, Guangdong, China | SZX |
Barcelona - El Prat Airport | Barcelona, Spain | BCN |
Istanbul Airport | Istanbul, Turkey | IST |
Seattle-Tacoma International Airport | SeaTac, Washington, USA | SEA |
McCarran International Airport | Las Vegas, Nevada, USA | LAS |