What is "skygunner"

SkyGunner is a 3D third-person combat flight simulator video game for the PlayStation 2. The game's setting and art style has elements of steampunk. It was developed by PixelArts and was released in Japan on September 27, 2001 by Sony Computer Entertainment. It was released to the North American market by Atlus USA on June 25, 2002. SkyGunner follows the story of 3 ace pilots, Ciel, Copain and Femme, who are hired to protect the "Eternal Engine", an engine capable of perpetual motion. Little do they know, the criminal genius, Ventre, is planning to use the town's celebration aboard the luxury airship, Merveilleux, as an opportunity to steal the Eternal Engine for his own evil ends. As the player progresses through the game, there's much more hidden elements to be desired, and new tasks to be completed.