United to Cut U.S. Flights  NEW YORK (Reuters) - UAL Corp.&lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=UALAQ.OB target=/stocks/quickinfo/fullquote"&gt;UALAQ.OB&lt;/A&gt;, the bankrupt  parent of United Airlines, on Wednesday said it would reduce  U.S. flights and increase capacity on more lucrative  international routes, in keeping with its aggressive  cost-cutting efforts.