Cerny is a commune in the Essonne department in Île-de-France in northern France. It is 53 km South of Paris. It has an airfield named A…Cerny is a commune in the Essonne department in Île-de-France in northern France. It is 53 km South of Paris. It has an airfield named Aérodrome de Cerny - La Ferté-Alais, including an airplane museum.