Airplane passengers without a REAL ID or passport could face an $18 fee under a new rule proposed by the Transportation Security Administration.

Under the proposed rule, set to be published in the Federal Register on Thursday, travelers without the required identification will have their identity verified on a new biometric kiosk system before they're permitted to pass through the checkpoint.

The $18 fee -- which will allow passengers to access TSA checkpoints for 10 days -- will be used to help pay for the new technology, according to the notice.

It's unclear when exactly the new system -- and accompanying $18 fee -- will roll out. The publication of the new rule in the Federal Register kicks off a public comment period on the proposed change.

The federal REAL ID Act was passed by C

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