Originally Posted by catandmouse

The upgrade city Kloten would be an add-on to your regular rail ticket giving you access to local transport in Kloten. Frankly it surprises me a little as Kloten is part of the Zurich transport area which is divided into zones and I don't really understand what's being offered in this case. Maybe a Zurich expert can help, but I doubt that in your case it's likely to be of any interest.