When we've taken ME to the BWI/BWV, the bus stopped at the CB first. However, I think it depends on the number of passengers and their destinations for any given day. I'm sure it varies.
Each time, so far, we've arrived at the BWV between 60 and 90 minutes of getting off the plane. (I don't count the time it takes to actually get off the plane - sometimes when we are in the back, it seems like forever, LOL).