Video of a real plane crash smoke plume

Here is a smoke plume from the crash of a large commercial jetliner (Tupolev 154*):

Here is how dissipated the plume is about 30 sec after it formed:

Compare that to the "Flight 93 plume" that had to travel about 250yd in 50 sec from the reported 9 knot wind to line up with this shot:

*Not 100% sure this link is of the same crash as the video. Regardless, look at the size and amount of debris it left after it crashed.