The official story of 911 from wikipedia
The September 11 attacks (often referred to as September 11th or 9/11) were a series of coordinated suicide attacks by al-Qaeda upon the United States on September 11, 2001. On that morning, 19 al-Qaeda terrorists hijacked four commercial passenger jet airliners. The hijackers intentionally crashed two of the airliners into the Twin Towers of the World Trade Centre in New York City, killing everyone on board and many others working in the buildings. Both buildings collapsed within two hours, destroying nearby buildings and damaging others. The hijackers crashed a third airliner into the Pentagon in Arlington, Virginia, just outside Washington, D.C. The fourth plane crashed into a field near Shanksville in rural Pennsylvania after some of its passengers and flight crew attempted to retake control of the plane, which the hijackers had redirected toward Washington, D.C. There were no survivors from any of the flights.
Nearly 3,000 victims and the 19 hijackers died in the attacks. According to the New York State Health Department, 836 responders, including firefighters and police personnel, have died as of June 2009. Among the 2,752 victims who died in the attacks on the World Trade Centre were 343 firefighters and 60 police officers from New York City and the Port Authority. 184 people were killed in the attacks on the Pentagon. The overwhelming majority of casualties were civilians, including nationals of over 70 countries. In addition, there was at least one secondary death—one person was ruled by a medical examiner to have died from lung disease due to exposure to dust from the collapse of the World Trade Centre.
The following sub-sections include observations and questions that need answering around the events of that fateful day.