Charles D. McKinley said he never intended to fly from New York City to Dallas locked in a shipping crate just large enough to fit his 5-foot-8-inch frame. He only wanted a free ride. "I would never, never do it over again," he said Tuesday from a Dallas prisoner holding facility, where he was being held on unrelated charges. Dressed in a white prison jump suit, Mr. McKinley spoke about his experience. "I would advise no one to ever do this," he said. Law enforcement officials questioning him Monday and Tuesday labeled him a potential terrorist, he said. "I never...