In my speech, I talked about the continuous descent approach method. As you know, the Montreal airport is surrounded by non-directional radio beacons that pilots use as navigational aids.
I'm not an aeronautics expert, but from what I understand, the situation right now is that a plane landing in Montreal can descend to 4,000 feet once it passes the beacon known as Maire, which is located 42 nautical miles from the runway. It will generally hit an altitude 3,000 feet when it's 27 nautical miles from the runway threshold, well before reaching the Sloka and Lonna beacons, which are 14 and 13 nautical miles from the runway. The plane's engine is then operating at 85% of maximum speed, which is very noisy. If the CDA method were adopted, planes would have to fly over the Maire beacon at 9,000 feet, which is much higher, and then start their final descent at about 30,000 feet, gliding the final distance with the engine at idle.