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After two days of health checks in Thailand, Yettaw boarded a flight Tuesday evening bound for the United States. He was using a wheelchair and wore a face mask as he mouthed "love you" to journalists watching Yettaw get on the plane.
Yettaw, 53, of Falcon, Missouri, spent three months as a prisoner in Myanmar after he visited the home of democracy icon Aung San Suu Kyi, under house arrest in the country.
Myanmar said they freed the prisoner because of his health -- he suffers from diabetes, epilepsy and asthma.