completion in the period 2022–2026. Public transportation Schiphol, together with the public transport authority Amsterdam, is going to transform its train- and bus station. The train station will be getting more entrances and the bus station will be completely renewed with a planned opening date in 2025. A connection to the Amsterdam Metro network has been a subject of discussion and speculation since at least the 1990s. In preparation for this, a piece of land has been acquired from Chipshol. , the project hadn't moved past the proposal stage. Airlines Schiphol's growth is hampered by slot restrictions from the government. For reasons of safety and noise reduction, Schiphol is allowed to have no more than 500,000 aircraft movements until the end of 2020. A proposal to increase the limit to 540,000 movements from 2021 onwards has been postponed until a new government is formed after the elections in March 2021. As Schiphol nearly approached the limit of 500,000 in the last few years, the slot restrictions have hindered airlines to settle at Schiphol. Among airlines that have expressed interest in flying at Schiphol are Atlantic Airways, JetBlue, Somon Air and SpiceJet. Tower The Schiphol air traffic control tower, with a height of , was the tallest in the world when constructed in 1991. Schiphol is geographically one of the world's lowest major commercial airports. The entire airport is below sea level. The lowest point sits at below sea level: below the Dutch Normaal Amsterdams Peil (NAP). The runways are around below NAP. Runways Schiphol has six runways, one of which is used mainly by general aviation. The airport covers a total area of 6,887 acres (2,787 ha) of land. Airlines and destinations Passenger Cargo Other users Other regular users of Schiphol are the Netherlands Coastguard whose aircraft are operated by the Royal Netherlands Air Force, the Dienst Luchtvaart Politie and the Dutch Dakota Association. Peak moments Typical peak moments at Schiphol Airport are between 9 a.m. and 11 a.m., and between 1 p.m. and 3 p.m. for departures, with up to 58 departures between 2 p.m. and 3 p.m. on a typical weekday (almost a departure every minute). The peak moment for arrivals is between 8 a.m. and 9 a.m. (with up to 52 arrivals on a weekday). Statistics Other facilities The TransPort Building on the Schiphol Airport property houses the head offices of Martinair and transavia. Construction of the