This is the TSA's first gun arrest at Newark Airport this year.
Port Authority police say the man from Alabama was caught with a .22 caliber handgun inside his carry-on.
TSA officers made the discovery while the man was going through a security checkpoint in Terminal B.
More than 4,000 guns were discovered in carry-ons nationwide last year. Almost 90% of them were loaded.
Officials say passengers are permitted to travel with firearms in checked baggage if they are properly packaged and declared. TSA has a complete list of those rules and regulations on their website.
Last year, 11 firearms were caught at Newark airport.
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