The Federal Aviation Administration is now investigating the Port Authority for its response to the January 4 snowstorm that crippled Kennedy Airport.

It's checking that the agency complied with regulations for snow removal.

The airport is still dealing with huge piles of lost luggage.

Delta Airlines says normal baggage operations returned last week. 

But there's still plenty of suitcases sitting around in Terminal 4.

A water main break shut down the terminal the same weekend as the storm, adding to delays and cancellations. 

Delta says anyone still looking for luggage should call 888-977-1005.