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The witness recalled the moment leading up to the impact with startling clarity. He was positioned in an office tower across the highway from the Pentagon when he noticed what appeared to be a small corporate jet. Describing the aircraft as "maybe a 20 passenger corporate jet," he observed it approach at a shallow angle, giving an ominous impression that it was about to land. With no distinguishing markings visible on the jet, the visual held an unsettling ambiguity.