Our starting point is the quest for a scientific quality control instead of the actual quest for quality and safety management in international civil aviation. We propose that the scientific quality control has to go beyond the analysis of a single aircraft accident investigation. Aircraft accidents are contextual driven and therefore contextual dependent. In consequence, this investigation firstly discusses the actual change of the safety-related contextual dimension, namely the change in the communication and navigation infrastructure of international civil aviation. Secondly this investigation discusses the quality and focus of databases being the evidence for the probability of aircraft accident in the sense of prevention. Thirdly this investigation demonstrates, as an example, how to proceed to determine a context-dependent aircraft accident rate for a certain airport concentrating on third party risk questions.