Welcome to Flyertalk.
If you use Search this Forum function with the keyword Aeroplan you will find many threads. I think this is one in which the WorldPoints to Aeroplan option is discussed:
http://www.flyertalk.com/forum/other...iance-ffp.html
I think you will find that Bank of America does not offer the same redemption options with every card which participates in WorldPoints. In other words, there are many variants of the program. What is the specific card that you hold? Have you looked at the online redemption catalog to see if transfers to Aeroplan are even mentioned?