I get to see this one up close at most of the Houston airshows where it is permanently assigned for NASA missions...It was built from a late 40's era Boeing 377 airframe, which was developed from the WWII military C-97 cargo plane, which in turn was designed from the Boeing B-29 bomber...The Guppy was refitted with upgraded turboprop engines...The video is from last month in Ohio picking up some bits and pieces for the Orion spacecraft......Ben