House, head office of Cathay Dragon. The Government Flying Service (GFS) has its head office building in the airport. Additionally the head office of the Air Accident Investigation Authority (AAIA) is in the Facility Building on the airport property. Airport expansion projects In June 2010, the Airport Authority unveiled plans to develop in stages the vast midfield site of the airport island. Stage 1 will involve the construction of a new 20-gate passenger concourse to be built in 2 phases (completion 2015 and 2020) with 11 gates in phase 1 growing to 20 gates in phase 2. The configuration of the new concourse is similar to those at Atlanta, Bangkok–Suvarnabhumi, Berlin (Terminal 1), Chicago–O'Hare (Global Terminal), Denver, Detroit (McNamara Terminal), London–Heathrow (Terminals 2 and 5), Los Angeles (TBIT), Munich (Terminal 2), Salt Lake City, Seoul–Incheon, Washington–Dulles and Felipe Ángeles International Airport (Zumpango). After stage 1 of midfield development is completed in 2020, there will be sufficient lands remaining for further new concourses to be built as and when demand for them materialises. Master Plan 2030 One year after, on 2 June 2011, the Airport Authority announced and released their latest version of a 20-year blueprint for the airport's development, the Hong Kong International Airport Master Plan 2030. The study took three years and according to the authority, nine consulting organisations have been hired for the research, observation, planning and advice. The main focus is to improve the overall capacity and aircraft handling ability of the airport. Based on this, two options have been developed. Option 1: Two-runway system To maintain the current two-runway system, there will be enhancements to the terminal and apron facilities to increase the airport's capacity. This option will enable the airport to handle a maximum of 420,000 flight movements per year, with annual passenger and cargo throughput increased to 74 million and six million tonnes respectively. The approximate cost of this plan is $23.4 billion Hong Kong dollars in 2010 prices, or HK$42.5 billion in money-of-the-day prices. The Airport Authority estimates that the airport will reach its maximum runway capacity sometime around 2020 if no extra runway is added. Option 2: Three-runway system This plan will focus on adding a third runway to the north of the Chek Lap Kok, the existing island the airport is built on, by land reclamation, using deep cement mixing, of about . Associated facilities, additional terminals, airfield and apron facilities,