I don't mean a swing wing in the traditional sense, they are far to complex, mind you they worked OK in the F14.
I'm trying to find a link to the design that I mean, but until then I'll descibe it.
Long fuselage, at about 2/3 from the nose imagine a larger version of a spitfire wing (elliptical) stuck to the top of the fuselage by a pivot abot which it would rotate. One side would be projected forward and the other back in the same way as if you held one side of a pair of scissors and opened and closed with the freely moving part of the scissors.
NASA Ames have built and flown a small version of this and the handling characteristics were superb as well as stability, it was only tested in the low speed envelope, below 250kts, but is a very promising idea, even Boeing are supposedly looking into the concept!! (not sure about at the moment as the bean counters seem to be in firm charge currently)