The 22-caliber handgun was detected by X-ray at a security checkpoint in Terminal C. It was loaded with four bullets, the TSA said.
The man, whose identity was not immediately available, was arrested by Port Authority police.
It was the 11th gun found at a Newark Airport security checkpoint so far this year. Passengers can travel with firearms in checked baggage if they are properly packaged and declared. Firearms must be unloaded, packed in a hard-sided case, locked, and packed separately from ammunition, the TSA noted, although firearm possession laws vary by state and locality.
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