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It is both, the air molecules do physically move, they have to otherwise you would have to re write some new physics theories, then there is also the pressure waves which are on the same spectrum as sound waves, but the big boom won't really be a concern for most of us.
I am slowly getting my head around the fact that the air is stationary and the vehicle is moving at the point of impact, so visualising the movement of boats is coming into play for me. I think a number things govern the aerodynamic solution, which includes the air volume moved, frontal area, shape & body length all have a bearing on how the air will return to the space vacated by the vehicle, different shapes will create different pressure profiles.
I don't know anything about B-Spline curves, but have been looking at some interesting stuff recently.
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