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10 great green moments in planes, trains and automobiles

Photo: Courtesy Worldwide Aeros Corp.

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Blimp plane

The blimp plane concept is simple: Combine the helium-powered lift of a blimp with some of the speed of an airplane. The results are a ship that derives 70 percent of its lifting power from a lighter-than-air gas, and is capable of cruising at 140 mph with an astounding 5,000 square feet of cabin space.