Let's take a moment, and assume 9/11 was a government conspiracy. What would the motive be, then? To "justify" the loss of thousands of people, as well as billions of dollars of damage, the government's gains would have to be extraordinary. Can you think of anything that would fit the description? No? Well guess what......niether can I. When you can give me a motive, then we'll discuss conspiracies.
Now, let's suppose it was a plane that hit the Pentagon. Imagine the scene at the Pentagon on the fateful day...on one hand, you've got this wall made of reinforced concrete, and backed by quite a bit of building material. It's stationary. On the other hand, there's this aerodynamic object, by contrast extremely fragile, yet travelling at a high velocity. The nose hits the side of the building, of course crashing right through. The main body of the airplane continued on through the hole, perhaps dislodging additional building material, but for the most part, building on the initial hole. When the wings hit on either side of the hole. One of three things can happen:
a) The wings are vaporized instantly due to the plane's velocity.
Not likely. You'd be hard-pressed to make a commercial plane go fast enough to cause several feet of aluminum to simply disappear, no matter what you hit.
b) The wings hold together, and continue straight through, along with the main fuselage, making a cartoonish-styled sillouette in the side of the building.
Also unlikely. The wings were designed to stand up to the incredible inertia of accelerating hundreds of miles an hour, while taking the brunt of that air resistance. They were not, however made to survive having an equal force shove them in the opposite direction. Air's powerful, but not that powerful, and the additional construction materials needed to make the plane stand up to this kind of force would easily render the plane unable to get airborne.
c) The foremost sections of the wings go through with the fuselage, but the farther-out parts break off, and carry with them the entire wing, and perhaps part of the fuselage. The wings are utterly shredded, and small parts are strewn everywhere, yet they fall inside the building due to their inertia.
The most likely occurrance, in my opinion. And if this is the case, you wouldn't be able to see much debris outside the Pentagon, such as in the picture here. And only their own personnel would be allowed inside, where the debris could be seen. In summary, the pictures posted here could easily be true, without a big conspiracy.
If you insist it was a missile that hit, try comparing the hole to what the missile would have to be. The damage was mostly caused by impact, not an explosion. If a missile had exploded, you'd see debris everywhere, including outside the building. It'd be hard to localize the blast of a warhead large enough to make that whole within such an area as to create that picture.
~Tsereve