According to the 2008 General Aviation Manufacturers Association report, general aviation contributes more than $150 billion to the US economy each year and employs over 1.2 million workers. About 2/3 of all hours flown by general aviation aircraft are for business purposes. In the United States, general aviation aircraft fly more than 27 million hours and transport 166 million people annually.
Source: Aviation Week and Space Technology, July 6, 2009. "Vision Plan: Cirrus team seeks new financing to fund and revive Vision program" by Frances Fiorino, p30.