Such an aircraft would not be able to achive high
velocities and would use up lots of energy.
Basicly, a hot air baloon or an airship do the
same thing, but the airship requires no power source
and the hot air baloon is more efficient than something
like the above is likely to be.
As for the skin idea, I really don't have a clue about anything
like that. I do know that there were and are experiments that
attempt the use of a pimpled - kin'na like a golf ball's, surfaces
that, supposedly, reduce drag. I'm not sure though weather its
applicable for all velocities - subsonic and supersonic and how
long it'll take for us to see flying golf balls, but it
seems promising. [;)]
Live long and prosper.