He left Rockwell in 1970 and devoted the next two years to creating the AT-300/301 Air Tractor, derived from the S-2B. Snow introduced his first turbine-powered model, the AT-302, in 1977. In 1991 he expanded with the AT-802, the world's largest ag plane and a model that helped the company grow internationally. Snow transferred ownership of Air Tractor to its employees in 2008 through a stock ownership plan. That same year he finished his autobiography, "Putting Dreams to Flight." An avid runner and fitness enthusiast, Snow twice competed in the New York City marathon. After the death of a highly regarded plant manager to a heart attack in 1989, he instituted free health screenings for all Air Tractor employees. A memorial service will be held at 2 p.m. on Saturday, Feb. 26th, at the Air Tractor headquarters in Olney.