KABUL, Aug 31 (Reuters) - Nineteen newly-freed South Korean hostages flew out of the Afghan capital on Friday after a six-week kidnap drama, a Korean embassy official said. The missionaries, part of a group of 23 kidnapped in mid-July, boarded a United Nations aircraft chartered by Seoul and will fly first to Dubai and then on to South Korea, the official said, adding he witnessed the take-off. The Taliban killed two male hostages, while two women released earlier as a goodwill gesture have already flown home. The kidnapping was the largest in the resurgent Taliban campaign against foreign forces since U.S.-led troops ousted the Islamists from power in 2001.