The TSA Form 415, officially titled the "Certification of Identity," is a document used at airport security checkpoints when a passenger is unable to provide a valid, government-issued photo ID. This often occurs if a traveler has lost their wallet, had it stolen, or simply forgotten it. The form requires the passenger to provide personal information such as their full name, current address, and other identifying details. TSA officers then use this information to cross-reference public and government databases—a process known as Knowledge-Based Authentication (KBA)—to verify the traveler's identity. In 2026, with the full implementation of the REAL ID Act, using Form 415 has become more complex, as it is generally only available to those whose identity can be definitively proven through secondary means. Travelers using this form should arrive at the airport at least two to three hours early, as the verification process and subsequent "enhanced" physical screening can be extremely time-consuming.