After 2011, "a Federal agency may not accept, for any official purpose, a driver's license or identification card issued by a state to any person unless the state is meeting the requirements" specified in the Real ID Act. The DHS will continue to consider additional ways in which a Real ID license can or should be used for official federal purposes without seeking the approval of Congress before doing so. States remain free to also issue non-complying licenses and IDs, so long as these have a unique design and a clear statement that they cannot be accepted for any federal identification purpose. The federal Transportation Security Administration is responsible for security check-in at airports, so bearers of non-compliant documents would no longer be able to travel on common carrier aircraft without additional screening unless they had an alternative government-issued photo ID.