US Airways, Lenders File Cash Pact  ALEXANDRIA, Va. (Reuters) - The government has thrown US  Airways &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=UAIRQ.OB target=/stocks/quickinfo/fullquote"&gt;UAIRQ.OB&lt;/A&gt; a lifeline until the middle of January,  agreeing with key lenders to extend financing the bankrupt  carrier must have to operate, court records showed on Tuesday.