US Air Pilots OK 18 Percent Pay Cut  CHICAGO (Reuters) - The pilots union at US Airways Group  Inc. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=AIR.N target=/stocks/quickinfo/fullquote"&gt;AIR.N&lt;/A&gt; on Thursday approved a \$300 million concession  package, including pay cuts of 18 percent, to help the ailing  carrier survive its second bankruptcy in two years.