Born in the United Arab Emirates, Banihammad left his family to pursue relief work. Using the Visa Express program, Banihammad obtained a U.S. tourist visa.
Banihammad arrived in the United States in June 2001. On September 11, 2001, Banihammad boarded United Airlines Flight 175 and participated in the hijacking of the plane, so it could be flown into the South Tower of the World Trade Center.
Fayez Banihammad purchased both his and Mohand al-Shehri's one-way first class tickets for United Airlines Flight 175 online on August 27 or 29, charging the $4464.50 to a Visa card from Mustafa al-Hawsawi, listing both of their addresses as a Mail Boxes Etc. in Delray Beach. This was not the same postal box used by Hamza and Ahmed al-Ghamdi who purchased their tickets for the same flight a day later with another Mailboxes Etc. postal box in Delray Beach, although both groups listed the same phone number.
Staying in the Milner Hotel from September 8–10, Banihammad asked a hotel clerk to fill out the registration card for the room, citing his poor English. On September 10, 2001, he shared a room with four hijackers; Mohand al-Shehri, Marwan al-Shehhi and Satam al-Suqami at the Milner Hotel in Boston, Massachusetts.
On September 11, Banihammad boarded Flight 175, he sat in seat 2A, adjacent to Shehri. About a half an hour into the flight, the plane was hijacked and subsequently flown into the south tower of the World Trade Center.