Hello Fuetesough53
It is possible to travel a day later, but not days later.
Your AIR RAIL ticket is valid for a period of 3 days:
- 1 day before the scheduled arrival;
- the arrival day itself;
- 1 day after the scheduled arrival day.
It is an open ticket for scheduled arrival day (ir a day before/after), you can take any train on that day (even hours after arrival in Zurich), or the day after, but not any time later in the week.
If you want to do so, you must change your entire flight booking to reflect a stopover in Zurich (as you were required to do if the entire trip was airbased).
The train ticket is part of your flight tcket and boarding pass; SBB cannot alter an AIR RAIL ticket.
Kind regards,
Roland