Implementing usable and accessible user interfaces is a challenge, especially for mobile applications. App developers have to include accessibility in an additional step during the implementation, very often they overlook this extra workload.There are concepts which combine Model Driven Development (MDD) for apps or semi-automatic support to create accessible software. But helpful tools to support accessibility features for apps during the implementation are hardly discussed in literature.The aim of this paper is a concept of model-based software development for accessible apps. Within the domain of transportation apps, we provide a model to create an app scaffold with the required elements and accessibility features included from the beginning.