A passenger managed to waltz past JFK's ramped-up security gantlet with three boxcutters in his carry-on luggage -- easily boarding an international flight while carrying the weapon of choice of the 9/11 hijackers, sources told The Post yesterday.

The stunning breach grounded the flight for three hours Saturday night and drew fury from Port Authority cops, who accused the Transportation Security Administration of being asleep on the job.

...

The TSA spokeswoman Davis insisted that the traveling public was not at risk.

"There have been a number of additional security layers that have been implemented on aircraft that would prevent someone from causing harm with boxcutters," she insisted.

Presumably, he didn't bring any toothpaste on board, so there was never any real danger.