The first aircraft involved in the September 11, 2001, terrorist attacks was American Airlines Flight 11. It was a Boeing 767-223ER that departed from Logan International Airport in Boston, Massachusetts, at 7:59 a.m., bound for Los Angeles International Airport. The flight was hijacked by five terrorists led by Mohamed Atta shortly after takeoff. At 8:46 a.m., the aircraft was intentionally crashed into the North Tower (Tower 1) of the World Trade Center in New York City, striking between floors 93 and 99. This catastrophic event killed all 81 passengers and 11 crew members on board, as well as hundreds of people inside the building. The impact was initially thought to be a tragic accident by many witnesses until the second plane, United Airlines Flight 175, struck the South Tower seventeen minutes later. The investigation into Flight 11 became the cornerstone of the FBI's PENTTBOM case, the largest in its history. To this day, the "8:46" timestamp is observed annually with a moment of silence across the United States to honor the victims of the first strike of the attacks.