Waleed al-Shehri
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Born in Saudi Arabia, al-Shehri had been a student until he accompanied his mentally ill brother to Medina. Later, he and his brother Wail went to Chechnya, where they fought in support of a jihadist insurgency against Russia. However, they were soon redirected to Taliban-controlled Afghanistan, where they were recruited to carry out the September 11 attacks. After their selection, the brothers were moved to a safehouse in Pakistan before flying out to the United Arab Emirates and starting the process to enter the United States.
In April 2001, al-Shehri arrived in the United States on a tourist visa. On the day of the attacks, al-Shehri, his brother, and the other hijackers took control of American Airlines Flight 11, following which Mohamed Atta flew the plane into the North Tower in a suicidal attack. Provided by Wikipedia