The Flitfire is a special edition of the Piper J-3 Cub that was used to raise funds to support the British war effort in World War II. In April 1941, prior to the United States' entry into World War II, Piper Aircraft and its distributors donated special edition Piper J-3 Cubs as a publicity event and a fundraiser for the Royal Air Force Benevolent Fund (RAFBF). These donated Cubs - painted with Royal Air Force insignia - were known as Flitfires.