'As a former General Electric Turbine engineering specialist and manager and then CEO of a turbine engineering company, I can guarantee that none of the high tech, high temperature alloy engines on any of the four planes that crashed on 9/11 would be completely destroyed, burned, shattered or melted in any crash or fire. Wrecked, yes, but not destroyed. Where are all of those engines, particularly at the Pentagon? If jet powered aircraft crashed on 9/11, those engines, plus wings and tail assembly, would be there.
Additionally, in my experience as an officer in NORAD as a Tactical Director for the Chicago-Milwaukee Air Defense and as a current private pilot, there is no way that an aircraft on instrument flight plans (all commercial flights are IFR) would not be intercepted when they deviate from their flight plan, turn off their transponders, or stop communication with Air Traffic Control. No way! With very bad luck, perhaps one could slip by, but no there's no way all four of them could!'
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