Clare's "flyover theory":

[link to 911research.wtc7.net]

Conclusion
The Pentagon 'flyover theory' is the central premise of The PentaCon, despite the fact neither CIT nor any of its supporters has provided a detailed account of how the "magic trick" could have been accomplished. That theory isn't even remotely plausible when one considers the number of observers who would have had a clear view of the purported overflight, even if the maneuver were engineered to be as inconspicuous as possible. Given the topography of the Pentagon's immediate surroundings, with its vast parking lots, highways and access roads of at least six lanes on each of its sides, and highrise buildings starting 300 feet to the south, such an event would have been witnessed by hundreds at least, as an unmistakable sight of a commercial jetliner leaving a huge explosion, as if it had bombed the building. The thunderous sound of the explosion would have guaranteed that most of the people in a position to see the event would have turned their heads to see the explosion and the plane in close proximity. The same witnesses would have been riveted to the action as the plane departed from the scene, whether it made a spectacular banking turn to land at National Airport, or made an equally spectacular climb away from the Pentagon over the Potomac.

Had that happened, nothing could have silenced the hundreds of diverse witnesses who saw something so unmistakable and so utterly irreconcilable with the official story that the silver jetliner had hit the Pentagon. Had that happened, CIT would have more to work with than a few witnesses who recalled seeing the jetliner flying to the north instead of the south of the Citgo station.