It takes a shit load of skill to get that plane that close to the ground and then maintain that angle of entry. If you know any thing about flying planes you would know this. I can not even attain that angle with a cesna which is tiny. Another problem is look at the highest point of the plane in the vidio. It is barely over that trafic cone. A 747 is a little over 64 feet from landing gear to the tip of the rudder. This vidio does not jive with the dininsions of the plane.
It came in at a steep angle and hit the ground just in front of the building Every plane that collides with the ground is 'barely over a traffic cone' before impact.
Your conspiracy is simply foolish. As it adds layers and layers and layers of complication unnecessarily. Your 'missile' theory would have to have a massive conspiracy cover up, dozens of faked witnesses, bought off or threatened first responders, planted wreckage with no one noticing, faked photos, faked radar records, a faked black box, faked bodies, faked autopsies, faked investigations, faked engineering reports, and a faked 911 report. Plus, since the plane was hijacked they'd have to dispose of the plane, fake the deaths of everyone on the plane or dispose of their bodies.
All with perfect secrecy for over 15 years? We couldn't keep our nuclear secrets for 5. But this stupidly complicated, wildly elaborate, insanely complex conspiracy that happened in broad daylight is kept in perfect secrecy for a decade and a half?
I have a much simpler explanation that matches the evidence:
The plane was crashed into the pentagon.