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London Heathrow Airport or Heathrow (IATA: LHR, ICAO: EGLL), located in the London Borough of Hillingdon, is the largest and busiest airport in the United Kingdom. It is the world's second busiest airport in terms of total passenger traffic and it handles more international passengers than any other airport in the world. It is also the busiest airport in the European Union in terms of passenger traffic and the second busiest in terms of traffic movements[3]. The airport is owned and operated by BAA, who also own and operate five other UK airports[4], and is itself owned by ADI Limited, an international consortium, which includes Caisse de dépôt et placement du Québec and GIC Special Investments, that is led by the Spanish Ferrovial Group[5]. Heathrow is the primary hub for BMI, British Airways and Virgin Atlantic Airways.
Located 12 nautical miles (22 km; 14 mi) west[1] of Central London, Heathrow was designed to have six runways in three pairs but now has two parallel main runways running east-west and five operational terminals. The site covers 12.14 square kilometres (4.69 sq mi). Terminal 5 was officially opened by Queen Elizabeth II on 14 March 2008 and opened to passengers on 27 March 2008. Construction of a new Terminal 2 complex to replace the terminal building and adjacent Queen's Building began in 2009; the first phase is expected to open in 2014[6]. Beginning in 2007 and completing in 2009, Terminals 3 and 4 have undergone major refurbishments. In November 2007 a consultation process began for the building of a new third runway and was controversially[7] approved on 15 January 2009 by UK Government