As part of an empirical investigation into factors contributing to the world-wide demand and supply of fixed-wing combat aircraft, the authors have conducted a search for data sources providing insight in the characteristics, types and qualities of aircraft designed for combat purposes, the total volume on the market (entries, movements and exits), as well as the financial equivalents of each in a specific period of time. This chapter discusses both the various pathways embarked on to this end, as well as the research results.