Officials said the incident was reported at about 10:30 PM on October 21 when on-duty CISF officials detected the live bullet of 9mm caliber gun in the lady's bag, when she was undergoing security check before taking a flight to New York.
They said the lady has been identified as M Posey and she was travelling with her husband to the US.
"The lady along with her husband were handed over to Delhi Police for further action. Carrying of firearms and bullets in aircraft is prohibited under the Indian aviation laws," the officials added.