The 5G System (5GS) is regarded as a multi-faceted, universal communication platform that could address the increasingly stringent requirements of both modern industries and network end users. Several proposed mechanisms, such as network slicing or its control exposure, aimed to facilitate access to the network for the external stakeholders, enable the creation of one common ecosystem that could be exploited according to the specific service needs. With the recent advancements in the automotive and aviation sectors, the significant increase of interest regarding the current state of preparedness of the 5GS and its capabilities to support those services is observed. The paper presents the analysis of the 5G technology readiness in the context of high mobility vehicular scenarios, including automotive and unmanned aviation use cases. The significant features and key gaps and challenges have been outlined with the emphasis on the dynamics of business processes and interactions between automotive, aviation and 5G ecosystems.