The bells will ring at approximately 8:45 a.m., 9:03 a.m. and 10 a.m.
Each ring commemorates the crash of American Airline Flight 11 in to the North tower of the World Trade Center, United Airlines Flight 175 into the south tower of the World Trade Center, American Airlines Flight 77 into the Pentagon and United Airlines Flight 93, which crashed into the field about 80 miles SE of Pittsburgh.
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