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WestJet Estimates Cut on Load Factor Woes  MONTREAL (Reuters) - Analysts chopped their fourth-quarter  profit estimates for WestJet Airlines Ltd. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=WJA.TO target=/stocks/quickinfo/fullquote"&gt;WJA.TO&lt;/A&gt; on  Wednesday and warned of turbulence in its share price, mainly  because of computer woes that hurt its online bookings. 