All aboard one of New York’s most vulnerable terror targets — the Kennedy Airport AirTrain.

“It’s unmanned and unpoliced,” Robert Morris, executive vice president of the Port Authority PBA, told a state Senate hearing today.

Especially vulnerable is the enclosed area near Terminal 4, which houses many international airlines — including El Al, the biggest Israeli airline and a longtime terror target.

Morris gave the committee a list of what he said were four terror-threatened areas around the region that ought to be better patrolled by Port Authority officers.

“We tried to handle this internally,” but Port Authority brass did not act, Morris said

He said his submission was private — but Sen. Greg Ball (R-Westchester) asked publicly about the AirTrain.

“This is the type of thign that should have been exposed years ago,” Ball said after the hearing.

“We should have uniformed people on that transportation corridor. We don’t in any way,” he said.