Subscription or flat rate models are flexible alternatives which have been used for many years now, especially in relation to large data bases which are now available, for instance, to Netflix or Spotify customers. Hence, it is worth to explore more flexible usage models, not only in the media (e.g., streaming or music), but in the automotive industry as well. Indeed, especially young drivers or people living in the city, seem to prefer having a car ready to use for a specific time period when needed instead of owning the vehicle. Thus, compared to typical options drivers have, i.e. buying or leasing a vehicle, subscription or flat rate models offer drivers a way to book a vehicle in a flexible way which can be canceled at any point.