Some routes are obviously completely full. Flew YYZ-YEG-SEA on Tuesday. First part was Rouge and then on Alaska. YYZ-YEG was oversold and looking for volunteers. I offered but they could not get me to SEA the same night at any time on any route. Apparently the next YYZ-YEG was oversold as was YYZ-YVR and YYZ-SEA. Got to be a lot of pissed of IDB pax.