Thieves made off with $300,000 in cash from JFK Airport in a heist that’s being investigated by the FBI, law enforcement sources said Wednesday.

The robbers swiped the cash that was part of a shipment from an armored car set to be flown to Florida, the sources said. It was unclear when the cash was taken.

Port Authority spokesman Scott Ladd said the heist is under investigation, but did not provide further information.

JFK has been the target of several high-profile heists in decades past by Mafia cohorts and other crooks. Most famously, mob associates ripped off more than $5 million in the 1978 Lufthansa heist.

On Wednesday, one law enforcement source mused that it’s “hard times” for robbers targeting JFK because of the meager takeaway.

“It’s $300,000. That would’ve been chump change for the mob,” the source said.