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 Biggin Hill Airport in the Court of Appeal. The court ruling prohibits the airport operators from allowing tickets to be sold for flights into and out of the airport, thus preventing its use for scheduled or holiday charter flights, but allowing business aviation and corporate shuttles. In May 2017 a runway (29/11) was permanently withdrawn from use. The airport is located on a hilltop, just to the east of the Bromley to Westerham road (A233) and about to the north of the town of Biggin Hill in the London Borough of Bromley. It is in a rural area to the south-east of Greater