I am in the process of confirming a trip with a client to BSL. I will be flying from YWG to BSL in November. When I look this up with aircanada.com it does not work as AC does not fly to BSL although Lufthansa does. When I look on the Lufthansa site they also will not show YWG to BSL. I Just called AC Res and they could only find a routing via CDG with CDG to BSL on Air France!

They could not book this routing and were surprised that it showed Air France. After speaking to their help desk the Agent determinded they have a flaw in their system related to BSL and its multiple names. In the end she could give me routings via YYZ or YUL.
From what I can tell, it looks like I should be able to fly to FRA via YUL or YYZ on AC. This will be my first international travel as an E and I would like to try to book a B or H fare so I can use SWUs. What routes/aircraft will give me best chance of using an SWU for this and what is the best way to try and book this?
Thank you.