Stranded traveler sleeping in airport A traveler sleeps on the floor of the JetBlue departures terminal at John F. Kennedy International Airport  in New York. A late winter storm was forecast to blanket New York City with as much as 7 inches of snow, prompting airlines to cancel more than 400 flights. (Photo: Daniel Barry/Bloomberg News)

Snowstorms and hurricanes, thunderstorms and fog. Bad weather is by far the biggest source of flight delays in the United States, according to the Federal Aviation Administration.

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