Delta Sees Much Wider 3rd-Qtr Loss  NEW YORK (Reuters) - Delta Air Lines Inc. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=DAL.N target=/stocks/quickinfo/fullquote"&gt;DAL.N&lt;/A&gt; on Friday  forecast a much wider third-quarter loss than Wall Street had  estimated, citing weak domestic fares and a spike in fuel  costs, sending its shares down nearly 6 percent.