AlHijjah 15, 1433, Oct 31, 2012, SPA - Superstorm Sandy grounded more than 10,000 flights across the Northeast and the globe, and it could be days before some passengers can get where they're going. According to the flight-tracking service FlightAware, more than 13,500 flights were canceled for Monday and Tuesday, almost all related to the storm. By early Tuesday morning, more than 500 flights scheduled for Wednesday also were canceled. Major carriers such as American Airlines, United Airlines and Delta Air Lines canceled all flights into and out of three New York-area airport, the nation's busiest airspace. About one-quarter of all U.S. flights travel to or from New York airports each day, so cancelations here can dramatically impact travel in other cities.