JetBlue January load factor slips to 78.1 pct = = = = Thursday February 5, 1:09 PM EST = NEW YORK, Feb 5 (Reuters) - Low cost airline JetBlue Airways Corp. (JBLU)= said on Thursday its load factor slipped to 78.1 percent in January from= 82.2 percent a year ago, hurt by winter storms. Traffic in January, measured in revenue passenger miles, rose 39.7 percen= t from the year-earlier period, the company said. = =A92003 Reuters Limited. = Roger EWROPS