The Daocheng Yading Airport is located in Tibet. Option 1, Thailand, is incorrect as the airport is not located in Thailand. Option 2, Philippines, is also incorrect as the airport is not in the Philippines. Option 3, China, is partially correct as the airport is indeed in China, but the correct answer is option 4, Tibet. This airport is known for being one of the highest airports in the world, situated at an elevation of about 4,411 meters (14,472 feet) above sea level. It serves as an important transportation hub for tourists visiting the scenic Yading Nature Reserve in the Daocheng County of Garzê Tibetan Autonomous Prefecture, Sichuan Province, China.