The hijackers on American Flight 11, United Flight 175, and American Flight 77 had boarded without incident, despite their apparent possession of short-bladed knives, not to mention previous travels and associations that should have been flaming red flags. They’d swiftly gained access to cockpits and replaced pilots with men who’d trained to fly jets expressly for the purpose of becoming martyrs. “Muscle” hijackers spread fear by attacking several crew members and passengers. They herded the rest to each plane’s rear section to keep them out of the way. Claims about bombs, whether true or
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