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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  call a strike should a federal court allow airline management  to void their contract, the Association of Flight Attendants  said on Monday. 