Wednesday, September 11th, 2019 marks the 18 year anniversary of the 9/11 terrorist attacks on the World Trade Center in New York City, the Pentagon, and United Airlines Flight 93 which crashed in suburban Pennsylvania. Patriot Day serves as a remembrance of the lives lost on that September morning.
By a joint resolution approved 12/18/2001, (Public Law 107-89) has designated September 11th of each year as "Patriot Day" which also directs the flags be lowered to half-staff for the entire day on September 11.