BEIJING - Construction of a new airport in south Beijing will start next year, and the facility is expected to be completed and put into use in 2018, local authorities announced on Wednesday.

Preliminary work prior to the construction of the airport, located in Daxing district, bordering Hebei province, is under way, sources with the Beijing Municipal Commission of Development and Reform said.

They added that the airport will be linked with three expressways, including one that will be newly built along the southern central axis of Beijing.

Under-way discussions over an urban rail transit to connect the airport are likely to be finished within the year.

The new airport project was approved at the end of 2012, as part of efforts to spur the development of Beijing's southern suburbs.

Meanwhile, an air transport-related economic zone is also planned, with an investment of 84 billion yuan ($13.39 billion).

Upon completion, the new airport is expected to ease traffic pressure on Beijing Capital International Airport, which remained the world's second-busiest airport in 2012 in terms of passenger throughput. Its passenger volume reach 81.8 million last year, according to a statement published by the airport in January.