Just to add an interesting tidbit to the discussion.....
The jet features the fuselage of the commercial 737-700 and the wings and landing gear of the larger 737-800.
Jim
Wow! Taking a page from the DC-8-62 book: Combining a fuselage that was only marginally longer than previous DC-8 series with the wings (and engines) of the already fairly long-ranged DC-8-63 gave Douglas the longest-ranged airliner of it's day.