US Air Flight Attendants Ready for Strike  WASHINGTON (Reuters) - Flight attendants at bankrupt US  Airways Group Inc. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=UAIRQ.OB target=/stocks/quickinfo/fullquote"&gt;UAIRQ.OB&lt;/A&gt; have authorized their union to  authorize a strike should a federal court permit airline  management to void their contract, the Association of Flight  Attendants said on Monday.