Originally Posted by JAGorham

You can go to either side; of course, if you have checked luggage to pick up, it only makes sense to use the side you are already at; otherwise, you have to go up a level, cross the terminal building, then go back down again.

Last summer, I just had carryon bags; my plane landed in Terminal B, and I just went straight across after leaving the secure zone and went to the A side for the National rental.