I've read a lot about the passes, but I still have two questions:
1) Is there an advantage to buying the Half-Fare card online vs at the Zurich airport when we arrive? I feel like I read somewhere that if you buy it online you can both print and have it on your phone, but if you buy it at a train station you only get a physical card, but I'm not sure.
2) Can the BO pass be put on your phone, or is it only available as a physical card at the station or by printing-at-home online?
Thank you!