Construction of the first phase of the new Shanghai Pudong International Airport began in October 1997, took two years to build at a cost of RMB 12 billion (US$1.67 billion), and was officially opened on 16 September 1999 and it replaced Shanghai Hongqiao International Airport as Shanghai's primary airport which was the city's only commercial airport until the completion of Pudong International Airport. Most international flights were gradually moved to Pudong after its opening. A second runway was opened on 17 March 2005, and construction of phase two (including a second terminal, a third runway and a cargo terminal) began in December 2005 and started operation on 26 March 2008, in time for the Beijing 2008 Summer Olympics. In November 2011, Pudong Airport received approval from the national government for a new round of expansion which includes two runways. The 3,800-metre (12,467 ft) fourth runway, along with an auxiliary taxiway and traffic control facilities, is projected to cost 2.58 billion yuan (US$403 million). The 3,400-metre (11,155 ft) fifth runway, along with a new traffic tower, will cost 4.65 billion yuan (US$726.6 million). Construction was completed in 2015 and has doubled the capacity of the airport. Pudong International Airport officially started the third phase of the Pudong International Airport expansion with the construction on a new south satellite terminal on 29 December 2015. The new satellite terminal will be the world's largest single satellite terminal with a total construction area of 622,000 square metres (6,700,000 sq ft), which is larger than the Pudong International Airport T2 terminal building (485,500 square metres [5,226,000 sq ft]). The satellite terminal is composed of two halls, S1 and S2, forming an H-shaped structure. It will have an annual design capacity of 38 million passengers, The total cost of the project is estimated to be about 20.6 billion yuan. Halls S1 and S2 will have 83 gates. A high capacity people mover connecting T1 to S1 and T2 to S2 will be constructed. After the completion of the satellite terminal in 2019, Pudong International Airport will have an annual passenger capacity of 80 million passengers, ranking among the top ten airports in the world by capacity. As of October 2019, the satellite terminal is in operation and connected by people movers to the main Terminals 1 and 2. By 6 January 2021, work on Pudong Airport T3 began on the south side of the airfield. The new terminal is anticipated to serve 50 million annual passengers when it opens according to city officials, while the entire airport is expected to have 130 million passengers by 2030. Several public transport lines will be extended to T3.