Airliners usually fly at very high altitudes. There are several reasons for this, one being to reduce fuel consumption. Flying at high altitudes means that the descent for landing must be well planned. The descent should be managed to ensure that the aircraft remains as high as possible for the longest period, and at the same time, the descent rate should be controlled so that it does not make it uncomfortable for the passengers.
Read More Here: How Do Pilots Decide When To Begin Their Descent? | SimpleFlying.com
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