I dunno, arcy. That photo with the 'tail section' at the rear of the fireball, doesn't LOOK like a tail section. It looks like the trees/shrubbery in the distance. Any threads/articles that discuss the angle that the plane hit the Pentagon at, or the location of the first 'strike'???
I doubt if the date is a major issue. From what I can remember of second-hand 'experience' with govt/military....the rules are... 'looks good on paper' and 'good enough for govt work. (ahem)