US Air, Pilots Union in Tentative Pact  NEW YORK (Reuters) - US Airways Group Inc. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=UAIRQ.PK target=/stocks/quickinfo/fullquote"&gt;UAIRQ.PK&lt;/A&gt; said  on Friday it reached a tentative agreement with its pilots  union that would save \$300 million annually and move the  bankrupt airline closer to carrying out a transformation plan.