OKLAHOMA CITY (AP) — Residents of five states may be barred from boarding a commercial flight using a driver's license as photo ID beginning in 2018 because of their states' refusal to comply with national proof-of-identity requirements.

The U.S. Department of Homeland Security confirmed Wednesday that it notified Oklahoma, Kentucky, Maine, Pennsylvania and South Carolina that requests for extensions to comply with the federal Real ID Act had been denied. The law passed in 2005 and imposes tougher requirements for proof of legal U.S. residency in order for state driver's licenses to be valid for federal purposes.

Three other states already have been notified that they are not in compliance with federal law.

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