Well as i know these impractical things and uneconomical ways of travel might work in future,humans will conquer planets like Titan witch are filled with natural gasses and stuff,witch will make this more cheaper.Well flying cars are practical becouse you dont need asphalt to drive on.Jetpacks would be to go on short trips.We all think of it as impossible becouse if we look at todays jetpacks,they look like fridges,but in the future they will be smaller,just as computers did.The first computer was like two huge fridges,and look at em now,you can put em in pockets.
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Scrab rules. 
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