KC-97 Stratofreighter

When I first saw it, this plane reminded me somewhat of the Super Guppy (plus it was pretty darned big!), so I took some pictures.

Upon returning home and researching it, I found that the KC-97 is the tanker version of the C-97, which is the military version of the Boeing 377 Stratocruiser, which is the base plane from which the Guppies were created.

More information about the various variations of this plane can be found here.