The Kosten unit (Ke) is a commonly used aggregate measure for aircraft noise in the Netherlands, developed by the Kosten Committee 1963. A yearly average which represents outdoor noise levels. Adviescommissie Geluidhinder door Vliegtuigen, 1967. Adviescommissie Geluidhinder door Vliegtuigen, Geluidhinder door vliegtuigen., TNO, Delft (1967). ...