Originally Posted by FlyerLX

… Sorry I’m still trying to get the bottom of this Z-B and B-Z bus….

Surely on the B-Z leg, you come out into Z, not A? I mean, it might look like A gates and there might be a big sign saying A but I’m guessing the doors are set so that the bus pax go into Z departures? If the bus driver lets you into A, she/he has admitted you to Schengen…