This bill establishes the Aviation Security Checkpoint Technology Fund within the Department of Homeland Security, specifically earmarking funds for the procurement, deployment, and sustainment of advanced checkpoint and exit lane technology. It also significantly modifies the existing Aviation Security Capital Fund, increasing its mandated annual allocation from the 9/11 Security Fee. The legislation expresses a Sense of Congress that the 9/11 Security Fee should be used exclusively for aviation security purposes, ending any diversion of these funds. Beginning in fiscal year 2026, the bill mandates that the first $500 million from the 9/11 Security Fee be deposited into the Aviation Security Capital Fund, a substantial increase from previous allocations. Subsequently, an additional $250 million from the same fee will be directed to the newly created Aviation Security Checkpoint Technology Fund each fiscal year. These funds will be available for grants administered by the Transportation Security Administration, with the checkpoint technology fund allowing for retroactive approval of projects initiated since January 2023.