Business 2.0 - Magazine Article - The Little (Jet) Engine That Could By combining the Williams engine with new automated airframe-manufacturing techniques, an all-digital avionics system, and creative partnerships with suppliers, Vern thinks he can get the cost of his six-seater jet under $850,000. That is less expensive than many turboprops and far cheaper than the best-selling business jet on the market today, the $3.6 million eight-seater Cessna Citation.