Head in the Clouds: Five Futuristic Concept Planes [SLIDESHOW]

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The airplanes we take for granted today seemed impossible not that long ago. Aeronautical technology has progressed by leaps and bounds over the years—and designers, engineers, and scientists continue working tirelessly to envision the aircraft of tomorrow. These projects are not just idle daydreams, but an important step in discovering what is possible and integrating that knowledge into future designs.