Variable area fan nozzle for turbofan aircraft engine

A variable area fan nozzle for a turbofan aircraft engine, comprising:

• a first structure defining a forward portion of a bypass duct of the turbofan aircraft engine;
• and
• a second structure defining an aft portion of the bypass duct disposed aft of the forward portion of the bypass duct, the second structure being movable relative to the first structure between a deployed position where a porting flow passage defined between the forward portion of the bypass duct and the aft portion of the bypass duct is open, and a stowed position where the porting flow passage is closed, the second structure comprising:
• a vane;
• and
• a slat attached to the vane and disposed forward of the vane, the porting flow passage extending between the slat and the vane when the second structure is in the deployed position.