Off the top of my head, I can think of one possible way, although I haven't actually tried it.  I would apply a smoke video to a flat plane as an animated texture and position the plane so that it looks like the smoke is emanating from the crashed aircraft..  To do this I use the movie node in the materials room and apply a transparency map video over the smoke video.  Here is an example of using the movie node.  Click on the Editorial tab.   This one doesn't have any transparency maps applied to it but I think you get the idea.