my guess would be that the relative speed of each crash would play a greater role in the end result.. my guess is that the plane in the video came cruising in for an emergency landing at < 200 mph?

You are making the conclusion that the plane turned to powder because you see powder being ejected from the point of impact.  Thats fair, but the plane is impacting a slab of concrete 10 feet thick.  The concrete is turning to powder and that is what you see being ejected, the pieces of the plane are surely within the ejected mass, but for the most part obscured, but not completely.

The plane's pieces should be moving away from the impact area at different speeds and different angles.  The concrete dust should also be moving away from the impact area at different speeds and different angles.

There are pieces of the plane clearly seen at the leading edge of the ejected material.  Other plane material can be assumed to be obscured by the concrete cloud.

Because it is not visible, does not mean it is not there, especially when you can see what is obscuring what should be seen. 

that slammed the pentagon @ 530 mph or disappeared in Shanksville with DNA or any other method. Ergo, the "official story" is a lie!

Killtown, you ask: "Does anybody know another instance where a large metal object turned to powder after striking a harder object at a significant speed?"

Yes, Killtown, other than Flights 77 & 93, there was another instance where a large metal object turned to powder after striking a harder object at significant speed.  In fact, these phenomena apparently occurred two (2) (and only two) additional times in the history of the world.

Both of these additional events apparently occurred on 9/11/01: i.e., when two (2) commercial aircraft (Flights 11 & 175) allegedly hit the NYC WTC towers.  There are plenty of pictures & videos, many eyewitnesses, and much evidence (or a pulverized lack thereof) of the disintegration & pulverization of these commercial aircraft at & around the 9/11 WTC sites.

No independently identified piece of the two (2) aircraft that crashed into the WTC towers has ever been found & publicly identified with serial numbers.  Although there are uncorroborated reports that the "Black Boxes" (data recorders) from these commercial aircraft were supposedly found, this was never confirmed; and the U.S. Government has never acknowledged finding these Black Boxes (much less examining the contents).

"Commercial Aircraft Pulverization upon Impact with Concrete, Dirt & Steel" may be an alternative hypothesis to the evolving "Official Government Conspiracy Theory" and to the much-maligned hypotheses of "9/11 TV Fakery" and "No Planes Hit Any 9/11 Sites."  Therefore, Nico Haupt, The Web Fairy, Morgan Reynolds, and their group should go back to the drawing boards to consider "Commercial Aircraft Pulverization upon Impact with Concrete, Dirt & Steel" as an alternative hypothesis.

Unfortunately, "Commercial Aircraft Pulverization upon Impact with Concrete, Dirt & Steel" only occurred on one (1) (and only one) date in the history of the world:  September 11, 2001.  Therefore, any attempt to replicate these phenomena will be futile.  So, don't try this at home. This may have something to do with the fact that 9/11/01 was a special date in history, and it only occurred once.  Otherwise, we may have no other explanation for these anomalous pheneomena, right?

P.S. By the way, were any of you an eyewitness to the molten, glowing irony & dripping sarcasm pouring froth from your 9/11 (XP) Windows?

Then nascars would turn to dust if they hit the walls at 480mph.

Regardless of whether or not flight 77 did hit the pentagon or not, the passengers were still murdered, as well as the victims inside the pentagon itself. Without clear footage of the strike, we can't be certain, we can speculate many different things, but one thing is for sure, the entire operation was an inside job! Whether passengers of flight 77 were killed when their plane hit the pentagon, or taken someplace else and murdered they were still murdered.

The same thing holds true for flight 93, they were still murdered whether the plane was shot down, or they were taken someplace else and murdered. The 'let's roll' story is a complete lie.

The twin towers and building 7 being destroyed with demolitions, with a couple of planes used for shock and awe value to cover up the use of the explosives blows the roof off of the enitre operation, that's why they refuse to acknowledge anything about building 7, and the use of explosives in any of the buildings.

If it is ever shown that 93 did hit the pentagon by way of crystal clear footage (which could even be manufactured) it doesn't prove that the entire operation was not an inside job, because the precision at which the plane was guided to hit the pentagon proves it was indeed staged. The plane would have had to have been flown by remote control, and the manner in which it was flown appears to be impossible according to experienced commercial airline pilots. For that matter the same applies to the precision of the planes that hit the towers, how could they not have been flown without remote control of some type?

Flight 77 hitting the pentagon just makes the murder weapon an uzi over a double barreled shot gun. It makes no difference to the victims, but proving who the actual murderers are, makes a world of difference!

-Ryback