US Airways Reaches Deal with Dispatchers  WASHINGTON (Reuters) - Bankrupt US Airways &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=UAIRQ.O target=/stocks/quickinfo/fullquote"&gt;UAIRQ.O&lt;/A&gt; on  Tuesday reached a tentative agreement on concessions with the  union representing dispatchers, the company said.