Thunderstorms hovered over New York airports on Saturday. LaGuardia took a hard blow. The FAA issued a temporary ground stop on LGA, Newark, and JFK. Officials cited a staffing issue. They lifted it fast. But the fallout was done. Hundreds of flights at LaGuardia never left the ground . Nationwide, over a thousand flights ran behind schedule. Another 108 got canceled . Delta took the hardest hit. Airlines counted more than 1,000 disruptions in just two days . A line of rough weather kept pounding its main hub.