All passengers on an American Airlines overnight flight to Chicago were ordered off a plane after complaints about a group of Arabic-speaking Iraqi men who were on their way home to Detroit. The incident forced passengers to stay overnight. The six Iraqi passengers had been training U.S. Marines at Camp Pendleton and worked for Defense Training Systems, a unit of the Alaska-based International Logistics Services Corp., said Dave Stephens, the company's chief executive officer. "They did nothing wrong," Stephens said Wednesday. A company press release called it "an unfortunate situation for all flight passengers."