How are the runways used at night?

During night-time hours, only one take-off runway and one landing runway are in use. In principle, these will be the Kaag runway and the Polder runway. These are the runways that cause the least noise pollution overall, because their approach and departure routes largely run above less densely built-up areas than the other main runways. It may be necessary to switch to a different runway due to weather conditions (strong westerly or easterly winds, poor visibility), unavailable navigation equipment or runway maintenance. Usually, this will be the Zwanenburg runway or the Buitenveldert runway. In principle, the Aalsmeer runway is no longer used at night. The Schiphol-Oost runway is always closed at night. However, in certain conditions, for safety reasons, it may be necessary to deviate from this principle.