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 City Airport London City Airport London City Airport is an international airport in London, United Kingdom. It is located in the Royal Docks in the London Borough of Newham, approximately east of the City of London and a shorter distance east of Canary Wharf. These are the twin centres of London's financial industry, which is a major user of the airport. The airport was developed by the engineering company Mowlem in 1986–87. In 2016 it was bought by a Canadian-led consortium of Alberta Investment Management Corporation (AIMCo), OMERS, the Ontario Teachers' Pension Plan and Wren House Infrastructure Management of the Kuwait Investment