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
S. Darius and S. Girėnas Airport with nearly 30 cities within the USSR, as far as Odessa and Simferopol. Regular passenger flights in Aleksotas airport were stopped in 1988 and were moved to a new Kaunas International Airport in Karmėlava at the northeastern outskirts of Kaunas. Paradoxically, the opening of the new airport coincided with long term decrease in the number of connections from Kaunas: the new airport had limited passenger facilities and the economic downturn of the early 1990s resulted in a significant overall reduction of air communication. After the withdrawal of the Russian Air Force in 1993, Aleksotas / S. Darius and S. Girėnas