• newly designed and constructed FAA certified 4 to 6 seat aircraft (prop, jet, and gyroplane), enabling lower acquisition and operating costs (see links to manufacturers)
• new smaller and lighter jet engines on some models capable of propelling the aircraft to speeds approaching large airliners  
• new computerized navigation systems for better aircraft control  
• government support by FAA and NASA under the JPDO (Joint Planning & Development Office) NGATS (Next Generation Air Transportation System)
• new unique safety features (a whole plane parachute, for instance, for some models)  
• Read "Free Flight: Inventing the Future of Travel" by James Fallows for more.

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