mad_jock, that's not strictly correct.
Ever noticed how utility lines never pass over a house? To do so would require an easement which requires the owner's permission. This applies to anything intended to be built or carried over the owner's land, that could reasonably cause obstruction/harm/cause an eyesore, etc.
So whilst the owner does not technically 'own' the airspace above their homes, they do have certain rights to it.