Assisted Passenger Prescreening System (CAPPS) for further screening of their checked baggage. As the CAPPS was only for luggage, the three hijackers did not undergo any extra scrutiny at the passenger security checkpoint. By 07:40, all five hijackers were aboard the flight, which was scheduled to depart at 07:45. Wail and Waleed al-Shehri sat together in first class in seats 2A and 2B respectively. The aircraft taxied away from Gate 26, and departed Logan International Airport at 07:59, following a 14-minute delay. Flight 11 was hijacked at approximately 08:14, which is when the pilot stopped responding to air traffic control. It is suspected that the brothers stabbed two flight attendants in the hijacking. At 08:46:40, Mohamed Atta, who was flying the plane, deliberately crashed Flight 11 into the northern facade of the North Tower (Tower 1) of the World Trade Center. The immediate damage destroyed any means of escape from above the impact zone, trapping 1,344 people. The North Tower collapsed at 10:28, after burning for 102 minutes. Aftermath Waleed al-Shehri was reported to have been found alive by a BBC News article on September 23, 2001, and other news reports in the aftermath of the September 11 attacks. Reports said that the al-Shehri brothers were the sons of a Saudi diplomat stationed in New Delhi, Ahmed al-Shehri. The diplomat's son was trained as a pilot at Embry-Riddle Aeronautical University in Daytona Beach, Florida, and was working as a pilot for Saudi Arabian Airlines. At the time of the attacks, he was in Morocco for a training program. There were also reports that Wail al-Shehri was a trained pilot. In the aftermath of the September 11 attacks, Saudi officials suggested that Wail and Waleed al-Shehri were victims of identity theft, but the diplomat's son was the victim of mistaken identity. Jamal Khashoggi, of Al-Watan and ArabNews in Saudi Arabia, spoke with Muhammad Ali al-Shehri in Khamis Mushait, who said his sons Wail and Waleed had been missing for months. He denied reports that Wail had an aeronautics degree, as some news reports said, "My son Wail was 25 years old and had a BA in physical education from the Abha Teacher’s College. He was mentally ill and had gone to numerous clerics for assistance in overcoming this instability. He had asked the school, where he taught, for a 6-month leave to go to Madinah." His father also told reporters that