First, there were airplanes, then dirigibles, then helicopters. Make way for the next completely different kind of aircraft: the Aeroscraft. So far, this fourth-generation craft is more conceptual than real, but if the science and the economics work out, this could revolutionize air travel.
To get a sense of the enormous size of this behemoth, check out this animated video of an Aeroscraft cruiser. (It’s a big file, so be patient.)