all of the men, taken from an AQ farewell video.
seen from United States

seen from United States
seen from Vietnam
seen from Singapore
seen from China
seen from China
seen from China
seen from China
seen from Canada
seen from Australia
seen from Mexico
seen from Germany
seen from Brazil
seen from Georgia

seen from United States

seen from China

seen from Sweden
seen from South Korea

seen from Russia
seen from Colombia
all of the men, taken from an AQ farewell video.
ahmed al-hanzawi, mohamed atta, wail al-shehri, satam al-suqami, majed moqed, khalid al-mihdhar, and waleed al-shehri were all flagged by CAPPS, the computer assisted passenger prescreening system inside of US airports, before the attacks.
none of the men on flight 175 were flagged.
khalid al mihdhar in the united states, 2000
khalid al-mihdhar's visa.
khalid al-mihdhar, and nawaf al-hazmi were in the united states as early as january 2000, before any of the hamburg cell pilot hijackers. however, hani hanjour was the earliest to stay in the united states, with his first time being in 1991. ten years before zero hour.
"Flight 77 hijacker, Khalid al-Mihdhar, purchased the used car in early 2000—around the same time he and al-Hazmi rented an apartment near San Diego. Al-Mihdhar transferred ownership of the car to al-Hazmi in May 2000. The car helped the two men and another attacker travel to Arizona, Connecticut, and Virginia as they planned and prepared for the attacks.
The vehicle is currently stored in the garage of the FBI Headquarters building in Washington, D.C."
source