Jianre Yixi prepares to fly a helicopter in southwest China's Tibet Autonomous Region, Aug. 7, 2019. The Qinghai-Tibet Plateau was once known as a "no-fly zone" and it was extremely difficult to fly helicopters there. Now, after professional and intensive training, the first batch of young Tibetans have flown civilian helicopters to the Mt. Qomolangma base camp. (Xinhua/Jigme Dorje)