Heavier-than-air flight? Preposterous!
The infrastructure that worries me is security. Eventually we'll have to fly naked, hosed in heavy-duty cheansing chemicals, and sedated. And buy new clothes at airport prices when we get there.
I find it hard to believe that there aren't commercial boat rides cheaper than airplanes. There should be a huge untapped market there. but it seems the only boats taking passengers across seas these days are luxurious cruisers that refuse to let you bring your own food. I guess no one has the patience to get on a boat for several days when airplanes can get you there in hours, only using several hundred times more energy.