Thunderstorms lingered above New York airports on Saturday. LaGuardia took a direct hit . 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, 1,191 flights ran behind schedule. Another scores of got canceled . Delta suffered the most . Airlines counted over a thousand disruptions in just a 48-hour span. A line of rough weather kept pounding its main hub.