Curfew
A curfew is a period, usually overnight, during which an airport bans or heavily restricts movements to limit noise for neighbours. London City closes from Saturday lunchtime to Sunday midday and every night; Zurich, Geneva, Frankfurt and Sydney restrict night flights; Van Nuys, John Wayne and Naples in the US enforce noise curfews on jets, and Ibiza and Palma limit night operations in summer. Curfews are a hard constraint, so a late-running dinner or delayed departure can mean diverting to another airport, an overnight stay or a fine for the operator. Ask your operator about curfews at both ends before setting an evening departure time.