Saint-Simon – Clastres Air Base (French: Base aérienne de Saint-Simon - Clastres) (ICAO: LFYT) is an abandoned military airfield, which is located approximately 3 km (2 NM) northwest of Clastres and east of Saint-Simon, both communes in the Aisne department of the Picardy (Picardie) region in France. It is approximately 116 km (63 NM) north-northeast of Paris. Today, it is mostly agricultural fields, and also a power-generating wind farm, with several electric generating windmills.