Passenger planes fly at an altitude of 35,000 feet (about 11 km), and most passengers don't consider why planes fly at such high altitudes. Some of the main reasons for this are:
1. Economic efficiency
Every aircraft has an ideal altitude at which it can be flown with minimum cost and fuel consumption. This elevation is usually between 35,000 and 42,000 feet (10-14 km). If the aircraft climbs higher than this altitude, there is not enough oxygen available to run the engine, and if the aircraft flies lower than this, air resistance increases.
2. Reduction of wind resistance
As the plane rises, the air becomes thinner, making the plane easier to fly and travel at higher speeds while burning less fuel. It also saves money. Heavier aircraft fly at lower altitudes while lighter aircraft fly at higher altitudes.
3. Avoid bad weather
By flying at thousands of feet altitude, the planes avoid bad weather near the surface.
4. Avoid air traffic
By flying at high altitudes, planes avoid air traffic from small planes and helicopters flying at low altitudes, as well as insects and birds.
5. Flight Safety
If a problem occurs with the aircraft at an altitude of 35,000 feet, such as loss of engine power, the pilot has more time to deal with the situation. It is important to know that aircraft can land safely even with all engines out of order.
FYI: In 1997, Alexander Fedotov set the record for the highest altitude by flying a Soviet military aircraft "Mag 25M" at an altitude of 123,520 feet (41 km).
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