A list and description of the hijackers of September 11 terrorist attack in New York. The success of the September 11 plot depended on the ability of the hijackers to obtain visas and pass an immigration and customs inspection in order to enter the United States. It also depended on their ability to remain here undetected while they worked out the operational details of the attack. If they had failed on either count-entering and becoming embedded-the plot could not have been executed. Here we present the facts and circumstances of the hijackers' travel operation, including their 25 contacts with consular officers and their 43 contacts with immigration and customs authorities. We also discuss the 12 contacts with border authorities by other September 11 conspirators who applied for a visa. The narrative is chronological, retracing the hijackers' steps from their initial applications for U.S. visas, through their entry into the United States, to their applications for immigration benefits, and up through their acquisition of state identifications that helped them board the planes. Along the way, we note relevant actions by U.S. government authorities to combat terrorism. There were a few lucky breaks for U.S. border authorities in this story. Mostly, though, it is a story of how 19 hijackers easily penetrated U.S. border security.