Economy of London project is construction of 42 km (26 mi) of new tunnels connecting stations in central London including a branch to Canary Wharf in east London. It is Europe's biggest construction project with a £15 billion projected cost. An additional line, Crossrail 2, has been proposed. London is served by six international airports which are the world's busiest city airport system by passenger traffic. These are Heathrow, Gatwick, Stansted, Luton, London City, and Southend. There are a number of proposals for expanding airport capacity for London including expansion of London Heathrow Airport and expansion of Gatwick Airport. The principal argument in
London International Airport 7 August 1942. In 1935 the city decided to replace the original London Airport. Site surveys and consultations took place and on 9 September 1939, at the start of World War II, work began on a new airport located near Crumlin. The city leased the new airport to the Government of Canada, Department of Transport on 24 January 1940 for the duration of the war. Runways 14-32 and 05-23 were paved and ready for use by July 1940 and the Royal Canadian Air Force established RCAF Station Crumlin on part of the airport. This air station was host to No.