Take it for what it's worth...
I think a job at Air Canada will (down the road) be not that bad. Your comment about slow advancement, doesn't apply here.
At the moment it is rapid promotion on the EMB. Sadly, for the time being it is terrible pay. Although we can hope for the best in '09.'
...that is IF (?) ACPA ever gets over itself.
There has been so much hiring that the young crowd should be able to punt the old ACPA guards, fat ass, over the horizon.
Or better yet, get a real Union.
Best wishes in your decision.