This paper proposes an analytical framework for estimating the domain in which a technology combination can be used in a system. To accomplish this goal, the concepts of technology critical zone and technological comfort zone were proposed in order to analyze the impact of a new technology during the design phases of a system. As a result, a framework was created that maps out the range of requirements that can lead to valid designs. This method can assist designers make decisions about technology selection by indicating the variety of requirements for which the technology can be used. Also, if a specific technology is to be used, whether it will be a cost and/or performance factor, depending on the circumstances. In this paper it is demonstrated on electric aircraft technologies, i.e., battery electric and hydrogen fuel cell aircraft. Instead of looking at the feasibility of looking at a specific range this method looks at the cost-benefit relation and a specific definition of this is introduced. This can then be used to analyze a specific technology in a certain application to map the range of valid requirements.