the subway line to the JFK air train is . trying to travel with anything larger than a backpack is a hassle on those trains (which are full of commuters) towards the airTrain. its just not worth the potential of missing a flight.... I've twice almost missed flights because of trains disruptions at broadway junction. maaaaaybe coming home with a light bag the subway is barely tolerable, but its almost always a better choice to spend the money on a cab.