Boeing Quarterly Earnings Jump 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 topped  expectations with a 78 percent jump in quarterly profit on  strength in its defense operations, and raised its earnings  forecast for 2004.