Patriot Day is a holiday observed in the United States on September 11 to commemorate the lives of those who died in the 2001 terrorist attacks on the World Trade Center in New York City and the Pentagon in Virginia and those who perished when the hijacked United Airlines Flight 93 crashed in Pennsylvania.
On Patriot Day, U.S. flags are lowered halfway, and there is a country-wide moment of silence at 8:46 am (Eastern Daylight Time), which is when the first plane crashed into one of the Twin Towers. Although the attacks were in the U.S., Patriot Day is recognized worldwide as the news devastated and impacted people all over.