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Most small airplanes use propellers and piston engines. Why? Jet engines are expensive, and you need two of them to lift an ordinary business jet off the ground. To make the first private jet able to operate efficiently with only one engine—also saving on maintenance and fuel costs—Diamond created a lightweight, compact and aerodynamically svelte design. It then lowered the maximum altitude to 25,000 feet, which is less demanding on the control, power and safety systems. Expect a lot of jets to follow in the D-Jet’s single contrail. $1.4 million; diamondair.com
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