A new study buy the Regional Plan Association concludes that new runways are needed at Newark & JFK where delays and cancellations often cause a ripple effect of chaos throughout US airspace. The report also admits that doing so will be difficult as extensive development surrounding the 2 airports makes the liklihood of expansion very difficult as it says makes expansion at New Yorks other airport, LaGuardia, impossible. The recent East Coast blizzard is cited as confirmation of how ineffective the NYC airports are at coping with cancellations.