If the CIT witnesses are telling the truth, and I believe they are, then flyover has been firmly established as the only possibility because of the physical impossibility to miss the North of Citgo (NOC) obstructions and still hit the ground floor of the Pentagon. Such a manuver simply could not be done, it is impossible for the plane to miss the tops of the obstructions and drop down to the first floor of the Pentagon in that short a distance.

The plane these witnesses saw MUST have therefore flown over the Pentagon because the flight path these witnesses establish cannot be reconciled with the physical damage and flight path established by the (staged) evidence. Also a NOC flight path cannot be reconciled with the north side light poles and other obstructions that are still standing. CIT has made a compelling case and it is not accurate to characterize it as a hastily adopted "theory".

Assuming the CIT witnesses are telling the truth, flyover is a fact period. Now flyover does NOT mean something else could not have hit the Pentagon such as a missile or another plane. Flyover also doesn't prove one way or another what caused the facade damage. CITs witnesses do PROVE the official account to be a lie however and that makes their evidence just as compelling as the evidence for CD of the towers in NYC. 13 independent and highly credible witnesses all cooroborating each other is pretty damn conclusive in my book.

It really comes down to a very simple equation once you strip away all the BS and intentional obfuscation. If the CIT witnesses are telling the truth flyover of the plane they saw is a fact.