US Air Pilots to Resume Giveback Talks  WASHINGTON (Reuters) - Negotiations on \$295 million in  concessions between US Airways Group Inc. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=UAIR.O target=/stocks/quickinfo/fullquote"&gt;UAIR.O&lt;/A&gt; and its  pilots union appeared back on track on Saturday although time  was running dangerously short for the carrier to strike a deal  with labor groups to avoid its second bankruptcy filing in two  years.