Federal regulators have let a deadline pass for raising antitrust questions about the planned acquisition of Denver-based ski resort operator Intrawest Resort Holdings Inc. by Denver's KSL Capital Partners and Aspen Skiing Co. The Aspen Times reports that, under federal antitrust laws, both the U.S. Department of Justice and the Federal Trade Commission had 30 days after being notified of the $1.5 billion deal to raise concerns about any anti-competitive aspects of the buyout. Intrawest (NYSE:...