Thunderstorms lingered above New York airports on Saturday. LaGuardia took a hard blow. The FAA imposed a temporary ground stop on LGA, Newark, and JFK. Officials pointed to a staffing issue. They removed it fast. But the damage was done. Hundreds of flights at LaGuardia never took off. 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 a 48-hour span. A line of rough weather kept battering its main hub.