Patriot Day is held each September 11 to honor the people who were killed in the terrorist attacks against the United States on September 11, 2001. US government buildings throughout the world fly the American flag at half-staff on this day, as do many private homes and establishments. Although schools, government offices, and businesses typically remain open on Patriot Day, communities throughout the country hold remembrances and events to honor the 2,977 people who died.