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
Groton–New London Airport Airport come from the Connecticut State Transportation Fund. Likewise, revenue derived from the airport is returned to the Transportation Fund. The airport is integrated into the statewide transportation plan, as well as the National Airport System Plan. There were 80,319 aircraft operations during 1999 at Groton–New London Airport which included military, general aviation and commercial flights. The airport has recently undergone $2,000,000 in renovations. The passenger terminal has been updated with new counter and seating areas and improved lighting. Groton–New London Airport covers an area of 489 acres (198 ha) at an elevation of 9 feet (3 m) above mean