I think you should be able to mount other people's mount depending what they are using for example:
The flying car: 4 people
Hippogriff: 3 people or 2 people depending on how staff feel.
I feel like you should be able to mount other people's mount's because it can making traveling a lot easier because some wizard's and witches don't have a mount or a broomstick at all and would like to ride with you as well. And maybe if this idea get's accepted then there could be challenges and tournaments of needing to have 2v2 or 3v3 of a mount races if this idea get's accepted maybe.
The flying car: 4 people
Hippogriff: 3 people or 2 people depending on how staff feel.
I feel like you should be able to mount other people's mount's because it can making traveling a lot easier because some wizard's and witches don't have a mount or a broomstick at all and would like to ride with you as well. And maybe if this idea get's accepted then there could be challenges and tournaments of needing to have 2v2 or 3v3 of a mount races if this idea get's accepted maybe.