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
Liège Airport Liège Airport Liège Airport , previously called Liege-Bierset, is an international airport located west of Liège in Wallonia (southern Belgium), mainly focusing on air freight. At the end of 2015, it was the 8th biggest cargo airport in Europe and the 22nd biggest in the world. The airport is located in Grâce-Hollogne, Liège Province, north-west of the city of Liège, in the east of Belgium. The first terminal on the site opened in 1930. It is mainly used for freight/cargo operations, but also serves more than 23 destinations for passengers (mainly charters). Liège is located in the centre of the