Yes, it is true that modern airliners often use a technique called “continuous descent” or “optimized descent” during the final stages of landing. This technique involves reducing engine power to a minimum, typically to “flight idle,” and utilizing aerodynamic principles to allow the aircraft to descend gradually and efficiently towards the landing airport.

The purpose of a continuous descent is to save fuel and reduce noise and emissions. By reducing engine power and allowing the aircraft to descend with minimal thrust, it takes advantage of the aircraft’s natural aerodynamic characteristics and minimizes the need for engine power to maintain a steady descent.

It is important to note that while modern airliners can glide for a considerable distance when engines are at idle, this does not necessarily imply that they are designed specifically as gliders. Airliners are optimized for powered flight and are not designed to be gliders in the same way as dedicated glider aircraft.

The ability of an airliner to glide is a result of its aerodynamic design, including factors such as its wing shape, lift-to-drag ratio, and the overall efficiency of its airframe. When engines are at idle, an airliner can maintain a controlled descent by adjusting its pitch attitude and configuring its flight controls appropriately.

While continuous descent is a common practice during landing, it should not be confused with a true gliding operation where the engines are completely shut down and the aircraft relies solely on its gliding capabilities. During a continuous descent, the engines remain operational but are set to a minimum thrust setting.

The use of continuous descent is a standard procedure employed by airlines to improve fuel efficiency, reduce environmental impact, and enhance overall operational efficiency during the landing phase of flight.