Jet Demand, IT Propel Lockheed Profit Up  NEW YORK (Reuters) - Lockheed Martin Corp. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=LMT.N target=/stocks/quickinfo/fullquote"&gt;LMT.N&lt;/A&gt;, the No.  1 U.S. defense contractor, posted a 41 percent jump in  quarterly profit on Tuesday, beating Wall Street forecasts, as  demand climbed for its combat aircraft and information  technology services.