U.S. air travelers who haven't upgraded to a Real ID can still fly without one , but starting Feb. 1 they'll be charged a $45 fee, the Transportation Security Administration said Monday.

Flyers without a Real ID, a passport or another acceptable form of ID will need to have their identities confirmed through a fee-based verification system called TSA Confirm.ID, the agency said.

The announcement of a $45 fee for people without Real IDs comes after the TSA started requiring the identification or other approved documents in May. The Real ID is a federally compliant state driver's license, learner's permit or nondriver ID card, identified by a black or gold star in the upper right corner.

Passengers without Real IDs "will be referred to the optional TSA Confirm.ID process for i

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