None of the witnesses have seen "AA77". They saw a large jetliner on a trajectory fundamentally different from the "official/real" flightpath.
So, as stated before - eighter you believe what their corroborated statements (not any of the literal lines) teach us about the plane, or you believe the data. The former would be option 4), the latter eighter 2) or 3). 1) it would be if you honestly think those people could all be mistaken (seen the CITGO testimonies?).
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None of none the "witnesses" described the aircraft in the necessary orientation for those flight paths north of the Citgo/Annex.
NONE of them.
Considering also the very short amount of time all witnesses had to observe anything as completely unexpected as the event was, and, be knowledgeable about what was going on, coherence in descriptions of this transient experience shouldn't be expected, nor made a hard base line for any conclusions.
Whether or not they identified AA 77 or the type of airplane is irrelevant.
AA 77 flew into the Pentagon.
The Flight Data Recorder information is Square One.
The impact damage to the surroundings of the building and in the building are Square Two.
The debris both airplane and human found in the building are Square Three.
"Witness" descriptions that vary as significantly from that data as has been collected and elevated to "fact" need not be considered. No more so than any UFO abductee's horrifying tale could be accepted as fact by anyone but the gullible.
QED.
Eyewitness testimony for any event is the least plausible source for anything, other than possibly confirming something occurred.
What that something might have been, real data has to be obtained, and for all the aircraft and crash sites on 9/11, this data exists and confirms the raw scenario of fanatics attacking facilities in the US, using hijacked airplanes.
Two in New York, one in Pennsylvania, and one in Washington DC. The origins and identifications of all pertinent information regarding those planes and their final destinations are hard fact.
The mental aberrations that entertain (it's not entertaining to sane people) a vast conspiracy can't even come up with 50% of a conspiracy, and are worthy of notation in DSM IV.