ELS and SHA are unique codes to identify airports used in the aviation industry. They are defined by IATA (International Air Transport Association) and are commonly called IATA codes. ELS to SHA refers to a flight route from East London Airport to Shanghai Hongqiao Intl Airport. Shanghai Pu Dong Airport (PVG), Hangzhou Airport (HGH), Wuxi Airport (WUX), Suzhou Airport (SZV), Nantong Airport (NTG) are other airports near this flight route and their unique identifiers/IATA codes.