A review and forecast of civil and military-transport aircraft costs. Within the study of the market of investments in high-tech industries, the authors have analyzed the market of civil and military-transport aircraft (CMTA), 1 using open databases on aircraft costs for the past 45 years to estimate the amounts of funds allocated for aircraft purchasing. The retrospective analysis of purchases will make it possible to estimate in a first approximation a long-term (10-15 years) outlook for the investment market.The finding show trends in the development of modern and future military aviation (see [1]), which may be extended to CMTA as well. The main conclusion is that aircraft cost is continually and evenly "chronologically" growing (10% a year) irrespective of how advanced and efficient the proposed aircraft design is. At the same time, the costs of planes that are competitive in the world market and that were manufactured in the same year are proportional to their masses and practically do not depend on their specifications and performance. Note that the cost of land and water vehicles is also growing similarly to that of military equipment but approximately two times slower.Relative to CMTA-producing and technologically advanced countries (the first group: the NATO countries and Sweden), we have obtained an empirical dependence of the catalog cost 2 of a commercially produced passenger (transport) plane on its mass and release date:where S tm is the catalog cost (million dollars at the current exchange rate) of a fully equipped empty commercially produced CMTA plane in its basic design (frame, engines, and equipment), m is the aircraft mass (t), and 1 CMTA here refers only to subsonic planes for line-haul and regional passenger and freight flights of more than 3 t. 2 The term "catalog cost" corresponds to the real cost of an existing line item on its release date, disclosed in the most reliable sources: specialized editions, catalogs, reference books, etc. [2-6].τ is the history or prehistory period from 1989. (Respectively, in 1988(Respectively, in -1990, the costs of CMTA planes produced in these countries were numerically almost equal to their masses: S tm ≈ m .)The practical applicability of formula (1) for calculating the catalog cost was confirmed by the analysis of the catalog costs of CMTA planes published in the last decades of the 20th century-the beginning of the 21st century (Fig. 1).Thus, the cost of any plane in the world aircraft market is predetermined by its mass and release year , while the impact of any other parameters is less one to two orders of magnitude. As a rule, the creation of a new and more advanced model leads not to a higher cost in the market compared to the previous model but only to an increase in its compatibility. The obtained formula (1) is similar to that presented in [1] for calculating the cost of military planes but differs from it by a simpler linear dependence on mass. (A more complicated dependence for military aircraft is possibly explained by the cost of arms and ...