The Sydney Airport (Kingsford-Smith) demand management framework is designed to control air traffic flow and mitigate noise and environmental impacts to surrounding communities by imposing an hourly maximum movement limit during non-curfew hours. According to International Air Transport Association standards, Sydney Airport is a level 3 coordinated airport, where demand significantly exceeds the airport capacity and it is necessary for all airlines and other aircraft operators to have a 'slot' to land or take-off at the airport.