An Imam, Ahmed al-Ghamdi was from the al Bahah Province of Saudi Arabia, a province in the south west of Saudi Arabia. It is the capital of Al Bahah Province nestled between the resorts of Mecca and Abha, Al Bahah is one of the Kingdom’s prime tourist attractions. Ghamdi shared the same tribal affiliation with fellow hijackers Saeed al-Ghamdi, Hamza al-Ghamdi, and Ahmed al-Haznawi. This group is noted as being some of the more religiously observant of the hijackers, and they are thought to have met each other some time in 1999. Known as al-Jaraah al-Ghamdi during the preparations, the only one of the hijackers to use a variation on his own name, Ahmed al-Ghamdi quit school to fight in Chechnya against the Russians in 2000, and received a US Visa on September 3 of that year. In November, both he and Salem al-Hazmi flew to Beirut, though on separate flights and at different times. Ghamdi flew on the same flight as a senior Hezbollah operative, although the 9/11 Commission could find no evidence that either knew the other. His family claims to have last seen him in December. In March 2001, Ghamdi is reported to have met with a Jordanian who has been charged with providing false identification to at least 50 illegal aliens. Hijackers Majed Moqed, Hani Hanjour, and Nawaf al-Hazmi are reported to have met with him at the same time. Inexplicably, this is more than a month before Ghamdi first arrived in the United States, according to the FBI and the 9/11 Commission.

On May 2, Ahmed al-Ghamdi arrived in the U.S. with fellow-hijacker Moqed, on a student visa. He listed the Naval Air Station in Pensacola, Florida as his permanent address on his driver’s license. He and Moqed moved in with Hani Hanjour and Nawaf al-Hazmi in Falls Church, Virginia. All four later moved into an apartment in Paterson, New Jersey. He called his parents in July 2001, but did not mention being in the United States. Hamza al-Ghamdi purchased Ahmed’s ticket online for United Airlines Flight 175 on August 29 or August 30, after buying his own. He listed a Mail Boxes Etc. address for Ahmed. Hamza and Ahmed al-Ghamdi stayed at the Charles Hotel in Cambridge, Massachusetts. On September 8 they checked out of the hotel, and moved into the Days Hotel on Soldiers Field Road in Brighton where they remained up until the attacks. On the morning of September 11, 2001, Ahmed left the hotel with Hamza, the two of them sharing a taxicab to get to Logan International Airport. There, Ghamdi showed his Virginia ID Card as identification, and boarded Flight 175 where he sat the furthest back of the hijackers, in seat 9D, helped to hijack it, and assisted as the plane crashed into the World Trade Center.[citation needed] Ahmed and younger brother Hamza al-Ghamdi pushed the passengers and crew to the back of the plane while Fayez Banihammad and Mohand al-Shehri killed the pilots Victor Saracini and Michael Horrocks allowing Marwan al-Shehhi to take control of the plane.