The member airlines of the International Air Transport Association (IATA) agreed on net zero carbon by 2050, forcing a significant shift to emission free flight which challenges the current State-of-the-Art and research in energy storage for all-electric aircraft. Especially, energy storage poses a significant challenge when it comes to range, selection and positioning inside the airframe. This paper investigates the most suitable battery types and their potential for electrification of aircraft as well as the currently possible range of a 72-seater regional airliner.