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The three planes that hit their targets on 9/11 show characteristics of pre-programmed autonomous control rather than human piloting. American Airlines Flight 11 maintained a high-speed nearly level final approach into the North Tower, United Airlines Flight 175 executed a coordinated high-bank turn into the South Tower at still greater ground speed, and American Airlines Flight 77 completed a descending spiral of continuous high-rate inputs into the western facade of the Pentagon.
The terminal segments of all three paths display a cluster of features characteristic of pre-programmed guidance. Sustained high kinetic energy was held into impact without measurable deceleration, continuous high-rate control-surface deflections maintained precise bank angles and pitch attitudes under elevated dynamic pressure, and the resulting geometric profiles remained smooth and free of the intermittent pauses typical of manual correction. Precise alignment to the chosen targets occurred without energy bleed or any recovery pitch-up, producing a lack of measurable variability across the independent trajectories.
Professional human pilots under calm conditions and with the explicit goal of striking the same targets would be expected to manage energy by reducing speed in the final approach and to introduce minor course and pitch corrections for refined alignment. Such behavior generates intermittent control inputs, observable variability in bank and heading, and a measurable bleed of kinetic energy prior to impact, none of which appear in the recorded paths.
Amateur pilots operating under the chaotic conditions of an active hijacking would face still greater obstacles. Limited aircraft type experience, cognitive load from the ongoing struggle, and the inertial demands of large commercial jets at high speed make the simultaneous achievement of continuous high-rate inputs, unvarying geometric precision, and zero energy management across three separate aircraft markedly less feasible than the same performance under automated command.
Given the independence of the three trajectories and the cumulative departure from expected human energy management and input patterns, the joint probability that all three were accomplished by human pilots falls substantially below ten percent once the assumed availability of remote-control autopilot is granted.
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