When they call just say your *willing* to be booked out of YFC-YYZ/YUL-LAS; because it is AC they can open up space for you; get you more direct flights and save you the hassle of driving to BGR. Looks like this will work out great for you :P
Just be careful with the flights to and from LAS; I believe most are now operated by rouge; if that does not concern you then push for that; else look up the scheduling; you might be able to also get something thru YYC/YVR although that would add another connection.