How many died in 9/11? A look at the tragic attack 23 years ago
11, United Airlines Flight 175 and American Airlines Flight 11 departed from Boston en route ... 9/11 Memorial and Museum.
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See PEOPLE's Incredible 20-Year Journey Documenting the Children Whose Dads Died on 9/11
For nearly two decades, PEOPLE has documented the journey of children whose fathers died on 9/11, before they ... died when American Airlines Flight 77 crashed into the Pentagon.