FedEx Quarterly Earnings More Than Double  NEW YORK (Reuters) - FedEx Corp. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=FDX.N target=/stocks/quickinfo/fullquote"&gt;FDX.N&lt;/A&gt;, the world's top  air-express shipper, on Wednesday said quarterly earnings more  than doubled on strong growth in its international, ground and  freight services.