Boeing Quarterly Profit Up 78 Percent  NEW YORK (Reuters) - Boeing Co. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=BA.N target=/stocks/quickinfo/fullquote"&gt;BA.N&lt;/A&gt; on Wednesday posted  a 78 percent jump in quarterly earnings that beat Wall Street  forecasts as stronger demand for its military networking and  weapons systems helped offset a decline in commercial airplane  revenue.