The Spitfire is a bird in the air. Not a machine in the air. There is a difference between the two. The Spitfire is a "free bird". Besides all of that, I just checked and 16 has no cost value. Besides all of that, all these airplanes are engineered into a matter of digital information that this man, "hi-tech", has made from the passion of his heart and love for these old WWII aircraft's. They all are "unique", and they all are beautiful in their own way. Know your aircraft, and know the aircraft you are fighting. Its as simple as that. Sheesh.