When we did b2b2b in Miami on the Magic a couple years ago, it was a little unorganized compared to other b2bs we've done. They had us wait in D Lounge and when everyone else was off, they led us off the ship. We went out through customs (that's where the escort left us). The group of us then headed out and were told that you couldn't get back to the check in area without leaving the building. You have to exit then walk around to the other end of the building (not a long walk, just inconvenient when there are a bunch of busses and shuttles in the area). When we got to the entrance there was a long line of new passengers waiting to get in. The people near the exit told us just to go to the door -- not worry about the line but we got a lot of dirty looks. When we got in, the person there wasn't familiar with b2b so we had to explain and he had to call upstairs. It wasn't a long delay and he let us go upstairs to check back in. In Miami the lobby area has two areas that they board from. The main boarding area was the one furthest into the building. They did early boarding for us from the one on the other end of the lobby -- closer to the entrance. Like I said this was a couple years ago so maybe everyone is more familiar with the process and it is smoother. Just wanted to give you my experience because the building isn't laid out the same so it isn't as easy as PC.