While it is beyond the reach of New York City taxis ISP is five minutes away from Ronkonkoma railroad station in turn a 1h20m train ride to Penn Station. This may seem very inconvenient for Newyorkers used to La Guardia airoport but it isn't so bad if compared with JFK. The airport is small and efficient. There are little or no delays on the ground. This field is used primarily by Southwest as its gateway to New York. Southwest partner ATA is another visitor while some legacy carriers only offer regional service to their respective hubs or focus cities. For those passengers who don't like turboprops be advised that Piedmont Airlines operates from this field with DHC8s for Us Airways express while Colgate uses tiny Beechcrafts on flights for Usair express and Continental (I find those tiny planes charming but many passengers complain). Overall a very pleasant passenger oriented airport.