Besnik Ismajlaj was allegedly able to get a gun past security on April 15.
According to the TSA, the gun was discovered in a bag during a security screening.
As agents waited for police, they say, the St. Charles man grabbed the bag and ran into the terminal.
Body camera video shows the moment Ismajlaj was arrested.
He is charged with a misdemeanor, accused of bringing a loaded concealed firearm onto a plane.
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