Marwan Yousef al-Shehhi (May 9 1978 - September 11, 2001) was named by the FBI as the suicide pilot aboard United Airlines flight 175 which crashed into the second World Trade Center tower on September 11 2001. He trained at the Huffman Aviation pilot school with Mohammed Atta. At 23 years of age, he was youngest of the four pilots. Wikipedia
The definitive Wikipedia entry for Marwan Al-Shehhi. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Marwan_al-Shehhi