Hi Fliegmitmir
Thank you for your request
There are two Half-Fare cards;
The Swiss Half Fare Card (CHF 120.- / valid 1 Month) https://www.sbb.ch/en/leisure-holidays/travel-in-switzerland/international-guests/swiss-halffare-card.html
The Half-Fare Travelcard https://www.sbb.ch/en/travelcards-and-tickets/railpasses/half-fare-travelcard.html (CHF 185.- / valid 1 year)
With the Swiss Half Fare Card it is not possible to buy a Day Pass for 2. You can of course buy a Half-Fare Travelcard at the Station Zürich Airport. Please complete and sign this form https://www.sbb.ch/en/travelcards-and-tickets/railpasses/half-fare-travelcard.html => Right under Download => Half-Fare travelcard application form (PDF) and present this document at the counter. Please don’t forget your photo!
I wish you a good afternoon.
Best regards
NicolasK