Thunderstorms lingered above New York airports on Saturday. LaGuardia took a hard blow. The FAA imposed a short 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 108 got scrubbed. 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.