Xining airport is about 3600 meters above sea level.

There is no Xining, with an altitude of 2200 meters. It is known as "the key to the West Sea" and "the throat of the sea". It is one of the high-altitude cities in the world and the largest central city in the whole Qinghai-Tibet Plateau. So the altitude of Xining airport is 2200 meters, not 3600 meters. Altitude refers to the vertical distance above sea level at a certain place on the ground. It is the height difference between a place and sea level, and is usually calculated based on the average sea level.