2,977 innocents, going about their daily lives, were killed in New York City, Washington DC, and outside Shanksville, PA
At the World Trade Center in Lower Manhattan, 2,753 people were killed when hijacked American Airlines Flight 11 and United Airlines Flight 175 were intentionally crashed into the WTC towers at 8:46 a.m. ET and 9:03 a.m. ET, respectively.
343 FDNY firefighters, 23 NYPD police officers, and 37 Port Authority police officers were killed in courageous service and response that day.
184 people were killed when hijacked American Airlines Flight 77 was crashed into the Pentagon at 9:37 a.m. ET.
40 passengers and crew members aboard United Airlines Flight 93 died when the plane crashed into a field, at 10:03 a.m. ET, after the passengers and crew attempted to retake control of the flight deck, preventing the aircraft from reaching its intended target.
Original source can be found here