At the heart of the expanded effort is a database called the Automated Targeting System, which is maintained by the Department of Homeland Security and screens travelers entering the United States.
Data in the Automated Targeting System is used to decide who is placed on the no-fly list — thousands of people the United States government has banned from flying — and the selectee list, an unknown number of travelers who are required to undergo more in-depth screening, like Mr. Darrat. The T.S.A. also maintains a PreCheck disqualification list, tracking people accused of violating security regulations, including disputes with checkpoint or airline staff members.
When I flew out of Burbank to Oakland on Sunday, the agent at the ID/boarding pass station had a mobile computer that he used to look up my information. It was the first time I'd seen something like this.