updated 7/18/2011 1:57:24 PM ET 2011-07-18T17:57:24

A Nigerian-American man has pleaded not guilty in Los Angeles to charges he breached airport security in New York and got a free ride on an LA-bound flight.

Twenty-four-year-old Olajide Oluwaseun Noibi entered his plea Monday in federal court. He faces up to 15 years in prison if convicted of being a stowaway and attempting to enter a secure area of an airport by fraud or false pretense.

Authorities say he boarded a flight in New York on June 24 using an expired boarding pass with someone else's name on it. The Virgin America crew didn't realize until mid-flight that an extra passenger was aboard.

Noibi spent several days in Los Angeles and was arrested when he tried to board a Delta flight with another expired pass.

Story: Man faces stowaway charges after airport arrest

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Video: Stowaway slips through airport security

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