honestly "knock on wood" but I hardly ever experience delays or AS metal. Before the JNU airport air to ground innovations or JAWS or whatever its called and had I been asked this in the 90s or even 10 years ago I wouldve said JNU was the most delayed or cancelled flights in my travels
In the last 2 years (or more), I think I've only been on one delayed AS metal flight and that was IAD-SEA due to weather last March and I certainly haven't experienced any chronically late AS flights.