Airline and security officials at Kennedy Airport let 150 passengers arriving from an international flight leave the airport without going through customs, the Daily News has learned.

American Airlines Flight 1671 arrived at JFK from Cancun, Mexico, at 8:50 p.m. Friday.

passengers walked out of the airport without having their passports or bags checked by Customs and Border Protection, sources told The News.

A source familiar with the matter said passengers disembarking the plane "just followed" a gate agent. The security snafu came just two days after ISIS released a video threatening New York City with a terrorist attack.