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 Southend Airport London Southend Airport London Southend Airport is an international airport in the district of Rochford in Essex, England, approximately from the centre of London. Southend was London's third-busiest airport from the 1960s until the end of the 1970s, when it was overtaken in passenger numbers by London Stansted Airport. Following its purchase by Stobart Group in 2008, a development programme provided a new terminal and control tower, extended runway, and connection to central London via the regular rail service running between Liverpool Street Station and Southend Airport Station on the Shenfield–Southend line, continuing on to Southend Victoria. EasyJet began operating