China's state planner on Monday approved a 42.1 billion yuan ($6.06 billion) airport expansion project in Urumqi, capital of the western region of Xinjiang, a key hub in China's Belt and Road initiative.
Construction will run through 2030 when the expanded airport is expected to handle 63 million passengers and 750,000 tonnes of cargo a year, said the National Development and Reform Commission (NDRC).
The expansion includes construction of two additional runways.
The investment value is over half of what China is spending on Beijing's new mega-airport project - Daxing International Airport - that costs 80 billion yuan and will serve 72 million passengers a year by 2025.
Xi's multi-billion-dollar plan aims to bolster a sprawling network of land and sea links with Asian neighbours and beyond.
China is planning hundreds of airports across the country to serve a market boosted by rising business travel and tourism fuelled by a growing middle class.
Many inland airports in cities such as Zhengzhou and Changsha have also expanded to serve inter-continental routes.
Urumqi already serves flights to and from Kazakhstan, Kyrgyzstan, Tajikistan, Uzbekistan, Russia and the United Arab Emirates.
China Southern Airlines, which just announced plans to leave the SkyTeam airline alliance, has a hub in Urumqi. ($1 = 6.9439 Chinese yuan renminbi)
(With inputs from agencies.)