Hong Kong International Airport has inaugurated its HKD10bn ($1.3bn) Midfield Concourse (MFC).
Auxiliary facilities, including an aviation fuel supply system and an automated people mover, have also opened, according to Asiatraveltips.com.
The construction of the 105,000m2 concourse commenced in 2011.
It will become completely operational in March, and slowly launch coffee shops, retail outlets and restaurants for passengers.
The MFC is located to the west of Terminal 1, between the two present runways.
It has 20 parking stands and links with Terminal 1 through an extension of the automated people mover system.
Airport Authority of Hong Kong chairman Jack So was quoted by Dfnionline.com as saying: "The MFC is an important development as it will help HKIA meet the increasing passenger traffic demand.
"In the past 12 months, HKIA has handled 68.2 million passengers, marking a year-on-year increase of 8.3%.
"With capacity to serve an additional 10 million passengers every year, the MFC will be able to increase the number of flights using air-bridges to board and disembark, enhancing the overall passenger experience."
Airport Authority Hong Kong executive director for airport operations CK Ng was quoted by Dfnionline.com as saying: "To ensure smooth airport operations, we will gradually increase the usage of the MFC as planned in the next few months.
"We expect it will serve about 20% of daily passenger flights when operating at full capacity by next March."
Image: Hong Kong International Airport opens Midfield Concourse. Photo: courtesy of Toyotaboy95.