This paper presents a method to synthesize aircraft noise. The method gives designers the opportunity to make a quick and cheap evaluation concerning sound quality of different design alternatives or improvements on existing aircraft. By presenting several synthesized sounds to a jury, it is possible to evaluate the quality of different aircraft noises and to construct a sound that can serve as a target for future aircraft designs. The combination of using a sound synthesis method that can perform changes to a recorded aircraft sound together with executing jury tests makes it possible to quantify the subjective perception of aircraft noise by humans.