Singapore Airlines is actually the only carrier to run thrice-weekly flights to Shenzhen. Shenzhen is a very popular destination for business activities, ranking 3rd after Hong Kong and Guandong. This new flight service is available on Tuesdays, Fridays and Sundays and takes just under four hours from Singapore. Sia also manages thrice-weekly services to the Chinese city of Nanjing, gateway to the rest of the eastern Chinese province of Jiangsu.