Yup, starting today 13R/31L is closed for the next few months in order to widen it and add some additional taxiways. We have reduced our flying into and out of JFK and added more flights out of BOS to compensate for it. I know American is not reducing their JFK flights and I don't know about Delta. Morning thu mid-afternoon shouldn't be too bad of a problem to get into and out of JFK with relative ease. The late-afternoon and evening flights are going to be a pain though.