Optima Bus, LLC, formerly Chance Coach Inc., is a brand of small transit buses manufactured by North American Bus Industries. It was established in 1976 in Wichita, Kansas.
It was originally the trolley and bus production business of Chance Industries Inc. In 1998, Chance Coach, Inc. was sold to American Capital Strategies, which rebranded the company as Optima Bus Corporation in 2003. American Capital subsequently sold Optima to North American Bus Industries, who closed the Kansas assembly plant on August 8, 2007 with production moved to their existing plant in Anniston, Alabama.  The brand name continues to be used.