A Redress Number is a unique seven-digit identifier issued by the U.S. Department of Homeland Security's Traveler Redress Inquiry Program (DHS TRIP). It is used by the Transportation Security Administration (TSA) Secure Flight program to help travelers who have been mistakenly identified as high risk or who have faced travel-related problems due to mistaken identity or other security concerns. The purpose of the Redress Number is to help resolve travel issues such as repeated delays, additional screening, denied boarding, or difficulties crossing U.S. borders that arise from being incorrectly matched to a watch list or flagged in security systems. By providing this number when booking flights, travelers can reduce the likelihood of being misidentified or subjected to unnecessary secondary screening in the future. People who share the same name as someone on a watch list or who have had travel difficulties related to mistaken identity often apply for and receive a Redress Number to improve their travel experience and avoid similar problems going forward. In summary, a Redress Number helps identify and verify travelers who have been incorrectly flagged by security, preventing further travel complications due to misidentification.