Excluding how a runway would exist at 30,000 ft, could landing a plane at that altitude be done? What would it take to do so?
Very Basic Wind rose for Mount Everest
Weather Phenomena That Could Impact Aviation Operations:
High Density altitude (1/3) density altitude of sea level. Planes capable of a ceiling of 35000 ft required. Ground effect deceleration landing required. Strong crosswinds and updrafts present year-round. Build from ice, the runway is 3 to 5 times longer to compensate for Density Altitude, wind, and ice. 10 percent chance of rain year-round. In the middle of June to September the monsoon season produces heavy precipitation. The temperature ranges from -2º F to -76º F. Banner clouds often present. The Subtropical jet stream maybe present with winds exceeding 80mph. If the Polar jet stream merges with the sub-tropical jet stream wind could exceeded 120mph. Supplemental oxygen maybe needed. Presume landing is done in head-wind only.
