During the first three flights, the tightly choreographed strategy worked. And one of the most important elements was timing. The plan to use the hijacked planes as weapons of mass destruction depended on the hijackers’ ability to commandeer and maintain control of fuel-heavy transcontinental flights that took off within a few minutes of one another. That narrow window maximized the element of surprise, which the hijackers understood or hoped would lead to a chaotic response, too late to stop them from reaching their intended targets. Conversely, delays would increase the chance that they’d be
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