If you look at the Flight radar application, you will see that while there are many planes flying all over the world , there are no planes in the Tibet region of China. So why don't planes fly over Tibet? When they pass over Tibet❓ Why do they go around it when they can go for a shorter time❓ In fact, the answer to this question is hidden in the "roof of the world" analogy used for Tibet. Tibet is a geography with an average altitude of 5 thousand meters above sea level and home to Mount Everest, the highest place in the world. So what does this have to do with airplanes? The cabins of modern passenger aircraft are pressurized. When a malfunction occurs in this pressure system, oxygen masks are first activated to allow passengers to breathe. However, the capacity of the oxygen system is sufficient for 15-20 minutes. ? Therefore, when a failure occurs in the cabin pressure system, pilots have to pull the plane to an altitude of 3 thousand meters. In most parts of the Tibetan region, the altitude is well above 3 thousand meters. There is no environment in Tibet where planes can descend safely in case of an emergency. Additionally, when one of the engines in twin-engine aircraft fails, the aircraft must descend to a certain altitude in order to fly safely. Unfortunately, this is not possible due to the geographical structure of Tibet. For these reasons, no planes fly over Tibet.