Based on the PHYSICAL EVIDENCE, however, a missile IS impossible.
BStrong outlined some of the major issues with this theory earlier in the thread; not the least of which is that before a missile can go "live" (that is, be armed) it has to fly a certain distance. The foot or so that existed prior to the plane's nose impacting the building is not sufficient distance. Then there's the utter lack of explosive residue found anywhere in the WTC debris (and they were looking for it). And to add to this, again, A MISSILE MAKES NO BLEEDING SENSE WHATSOEVER. WHY would a passenger jet, which is by design unequipped to fire ANYTHING (it simply doesn't have the hardware to make it capable of doing so), suddenly in your head be able to fire one when the plane was about to plow into a building anyway? The physics tells us that inertia alone would be sufficient to allow the plane to easily penetrate the building, given the specs on the building and plane which are easily locatable in the public realm, as well as knowing the approximate speed the plane was flying at when it impacted. A missile would be an utterly USELESS addition that would accomplish absolutely NOTHING but making people scratch their heads in confusion as to why it was there in the first place!
Visual evidence can be deceiving, tmd; perception is everything. You see, the vast majority of posters in this thread have viewed the videos and agree that the flash occurred AFTER the impact; you are the only one saying it happened BEFORE the impact. Which is more likely; that your eyes are deceiving you, or that some sort of projectile weapon was fired from a passenger jet that was about to plow into a building anyway? If you said the second option, you need to look up Occam's Razor. That is why the PHYSICAL evidence will always and forever trump so-called "eyewitness" testimony; because it is evidence that can be backed up with PROOF. And the physical evidence tells us... guess what... THERE WAS NO MISSILE.
I refer you to the famed quote by Sherlock Holmes: "Once you have eliminated the impossible, whatever remains, however improbable, MUST be the truth." (The Sign of the Four, Ch. 6) You yourself in the post quoted above admitted that some of the options presented to you are, in your words, "extremely unlikely", which by inference tells us that you at least think there's a possibility they could be true under the right circumstances. Since we have eliminated a missile due to the complete lack of PHYSICAL evidence (knowing that visual evidence is completely inadmissable; the eyes can be deceived), that leaves us with the "extremely unlikely" options given to you by various posters here as reasonable possibilities that actually ARE backed up by the physical evidence in existence. Given that, which of the "extremely unlikely" options are you willing to accept? Because a missile is physically impossible. Learn to accept that and you might actually be able to climb out of the morass of lunacy that is trutherdom.