More than 12,000 flights were canceled or delayed across the U.S. so far Monday after a massive winter storm snarled air travel at some of the nation’s busiest airports over the weekend.According to flight-tracking site FlightAware, cancellations totaled 4,245, while delays reached 8,831 as of 7 a.m. Monday.Major hubs nationwide were still feeling the impact of the storm that dumped heavy snow and unleashed crippling ice.Boston Logan International Airport had 296 flight cancellations so far Monday, while John F. Kennedy International Airport and LaGuardia International Airport in New York had...

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