Thanks Bergeriel, you have it in a nut shell. Kieth williams as an ATPL Instructor you surely must know gliding to touch-down will never be part of the equation due to 'stable approach' requirements. As Bergeriel states CDA is and has been a standard method of descent since jets were invented. What stops a 'perfect' idle descent being ATC requirements. The only thing that is changing is trying to get ATC more on board. With the traffic density the way it is I have my doubts, but it's worth a try. As for the 727, if any aeroplane needs power to land, thats the one. You never closed the thrust levers until you were finished with the wings.