He was one of the four hijackers of United Airlines Flight 93, which was crashed into a field in Stonycreek Township, Pennsylvania, following a passenger revolt, as part of the September 11 attacks.

He arrived in the United States in June 2001 under the direction of Al-Qaeda for terrorist attacks, on a tourist visa.

Instead, the plane crashed into a field in Somerset County, Pennsylvania, after the passengers on-board started a revolt against al-Haznawi and the other hijackers.

[3] His father and brother, Abdul Rahman al-Haznawi, reportedly last heard from him in late 2000, after he made references to training in Afghanistan.

He is believed to have moved in with Ziad Jarrah, who got a new apartment on Bougainvilla Dr. in Lauderdale-by-the-Sea, after both men gave the landlord photocopies of their German passports, which he later turned over to the FBI.

[6] On June 25, Jarrah took al-Haznawi to Holy Cross Hospital in Fort Lauderdale on advice of his landlord.

[10] On September 7, all four Flight 93 hijackers flew from Fort Lauderdale to Newark International Airport aboard Spirit Airlines.

On September 11, 2001, al-Haznawi arrived at Newark International Airport to board United Airlines Flight 93.

[11] Due to the flight's delay, the pilot and crew were notified of the previous hijackings that day and were told to be on the alert.

[14] A videotape titled "The Wills of the New York and Washington Battle Martyrs" was aired on Al Jazeera on April 16, 2002.