London Heathrow Airport is a major international airport serving London, England, United Kingdom. Located in the London Borough of Hillingdon, in West London, Heathrow is the busiest airport in the United Kingdom and the third busiest airport in the world (as of 2012) in terms of total passenger traffic, handling more international passengers than any other airport around the globe. It is also the busiest airport in Europe by passenger traffic and the third busiest by traffic movements. Heathrow is London's main airport, having replaced RAF Northolt and the earlier and better-known Croydon Airport, and together with Gatwick, Southend, Stansted, Luton and London City, London is the busiest city airport system in the world by passenger traffic (with 133,666,888 passengers travelling through the six airports); and second only to New York City in terms of traffic movements. Terminal 5 was officially dedicated 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 old terminal building and adjacent Queen's Building began in 2009 with the first phase expected to open in 2014. Terminals 3 and 4 underwent major refurbishments between 2007 and 2009. In November 2007, a consultation process began for the building of a new third runway and a sixth terminal, which was controversially approved on 15 January 2009 by UK Government ministers. The project was subsequently cancelled on 12 May 2010 by the Cameron Government.

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