the 75th anniversary of Pearl Harbor memorial flight at the Planes of Fame's annual air show featured their freshly rebuilt all original Mitsubishi A6M5 Zero powered by it's original Nakajima Sakae 31 engine. This is the only fully authentic flyable example that's flying in the world. More info can be found here on the Planes of Fame website. http://www.planesoffame.org/index.php...