Why planes fly at 35,000 feet Planes fly at high altitude and actually the policy is the higher the better. One of the main reasons behind aircraft altitude is that. As the air gets thinner planes can travel more easily and therefore move faster and burn less fuel. Therefore saving money. The “sweet spot” of flying is regarded as between 35,000 and 42,000 feet .The airline industry still uses feet as its standard measurements. Too high […]