You stand more of a shock hazard from the lighting just hitting nearby than you do from it hitting the plane then making it's way to you. You also stand more of a shock hazard just from touching a plane that isn't grounded than a lightning risk would represent. Ground that damn plane prior to touching it.
Alot of airports are in flat areas and represent the highest conducting points in the immediate area. The rebar in the runways, the buildings and just about everything there is a nice lightning target. Unless there was a need to be out, I wouldn't even think about it.