BEIJING’s Daxing International will be the largest airport on the planet when it opens for business in 2019. <RENDERING – Zaha Hadid architects>  DAXING will have eight runways, and will be able to serve up to 100-million passengers annually. Over the next 20 years, commercial passenger traffic in the Asia-Pacific region is forecast to increase by 1.8 billion, the same amount for the rest of the world combined.  Three big commercial service providers — Air China, China Eastern & China Southern — are already vying for space at Daxing in Beijing’s southern suburbs.