TACOMA, Wash. (AP) — The standard-issue driver's licenses carried by most Washington residents are still accepted at the airport, but that could change following a federal warning that passengers on commercial air flights may need more proof of identity.

The News Tribune reports Department of Homeland Security spokeswoman Amanda DeGroff said in an email the federal agency is working to release an announcement about changing air-travel requirements. Washington would get 120 days' notice before the rule requiring residents to provide a passport or enhanced state ID to fly takes effect.

About 500,000 state residents have an enhanced Washington driver's license.

Washington remains one of several states that have not complied with the Real ID requirements passed by Congress in 2005. DHS denied Washington's request for an extension on the requirements in October.

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