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9:45: United States airspace is shut down.
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9:59:00: The South Tower of the World Trade Center collapses, 56 minutes after the impact of Flight 175.
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10:03:11: Flight 93 is crashed by its hijackers as a result of fighting in the cockpit 80 miles (129 km) southeast of Pittsburgh in Somerset County, Pennsylvania.
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The president made a speech about what happened and how tragic it was. He recognizes the nations heroes and other people.
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After the September 11th attacks on the World Trade Center, the rescue and recovery clean-up of the 1.8 million tons of wreckage from the WTC site took 9 months.