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 DLR station 22 minutes to Bank in the City of London. Trains run eastbound every 10 minutes to Woolwich Arsenal. The journey time is 6 minutes to the terminus. In peak hours, the frequency increases to one train every eight minutes on both the Bank–Woolwich Arsenal and Stratford–Woolwich Arsenal lines, providing a service every four minutes between Canning Town and Woolwich Arsenal. London Buses routes 473 and 474 serve the station. London City Airport DLR station London City Airport is a light metro station on the Docklands Light Railway (DLR) Stratford-Woolwich and Bank-Woolwich Lines; serving London City Airport in East London. It