I'm flying RT BOS-ZRH, connecting via JFK both directions. Receipt shows this booked as OZ. First three legs were as expected with boarding passes all showing Zone 1 boarding. I just noticed my boarding pass for the final leg shows Zone 4. Is this just a random easily-resolved hiccup, or did I somehow mess something up during booking?

It doesn't really make a difference on this flight since I'm not carrying anything aboard aside from my charming personality*, I'm just curious for the future.


* Is this where it all went wrong?