FILE - In this Thursday, Dec. 27, 2012 file photo, snow is cleared on a runway as a plane taxis into Manchester-Boston Regional Airport in Manchester, N.H. As the Northeast braces for its largest winter storm in more than a year, airlines are already employing a strategy that has served them well in recent years: Cancel flights early and keep planes, crews and passengers away from snowed-in airports. (AP Photo/Elise Amendola, File)
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