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 of the nearby US Coast Guard Academy. Groton–New London Airport was established as the first State of Connecticut airport in 1929. Originally called Trumbull Airport after Governor Jonathan Trumbull, the airport was taken over by the United States Army Air Corps in August 1941 as a First Air Force group training base, although the runways were still grass. In 1942, the Army constructed a base and hard-surfaced runways and designated the airport as Groton Army Airfield. Through all of 1943, a total of 10 squadrons of P-47 Thunderbolt fighter groups trained at the field, with the last unit departing for