An aerial tram? Is that like a cable car? I shudder to think of a Zürich tram going airborne!

With a GA, you can travel on
most trains for free (except for some private ones), and on
most boats (except for some private ones), and on pretty much all buses.
For cable cars, gondolas, funiculars, mountain railways etc, you can expect to pay half price like you would with a half fare card. I'm pretty sure that applies to both the Jungfraujoch and the Schilthorn. Of course some don't offer any discount because they're not affiliated with the SBB in any way.
For a good overview map see the SBB's
GA page and see the "Übersichtskarte".